Finding the Fourth Proportional to 1,007,880.78, 1,390,875.54 and 555,171.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,007,880.78 : 1,390,875.54 = 555,171.78 : x
2. Step 2: Convert to fraction form
   1,007,880.78/1,390,875.54 = 555,171.78/x
3. Step 3: Cross multiply
   1,007,880.78x = 1,390,875.54 × 555,171.78
4. Step 4: Simplify right side
   1,007,880.78x = 772,174,849,300.26
5. Step 5: Solve for x
   x = 772,174,849,300.26/1,007,880.78
6. Step 6: Final answer
   x = 766,137.09