Finding the Fourth Proportional to 1,011,638,300.78, 1,395,287,886.61 and 870,745,484.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,011,638,300.78 : 1,395,287,886.61 = 870,745,484.09 : x
2. Step 2: Convert to fraction form
   1,011,638,300.78/1,395,287,886.61 = 870,745,484.09/x
3. Step 3: Cross multiply
   1,011,638,300.78x = 1,395,287,886.61 × 870,745,484.09
4. Step 4: Simplify right side
   1,011,638,300.78x = 1,214,940,626,275,670,528
5. Step 5: Solve for x
   x = 1,214,940,626,275,670,528/1,011,638,300.78
6. Step 6: Final answer
   x = 1,200,963,452.39