Finding the Fourth Proportional to 1,155,321.91, 1,594,221.57 and 638,993.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,155,321.91 : 1,594,221.57 = 638,993.76 : x
2. Step 2: Convert to fraction form
   1,155,321.91/1,594,221.57 = 638,993.76/x
3. Step 3: Cross multiply
   1,155,321.91x = 1,594,221.57 × 638,993.76
4. Step 4: Simplify right side
   1,155,321.91x = 1,018,697,635,287.40
5. Step 5: Solve for x
   x = 1,018,697,635,287.40/1,155,321.91
6. Step 6: Final answer
   x = 881,743.54