Finding the Fourth Proportional to 1,145,436.97, 1,580,706.71 and 636,139.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145,436.97 : 1,580,706.71 = 636,139.34 : x
2. Step 2: Convert to fraction form
   1,145,436.97/1,580,706.71 = 636,139.34/x
3. Step 3: Cross multiply
   1,145,436.97x = 1,580,706.71 × 636,139.34
4. Step 4: Simplify right side
   1,145,436.97x = 1,005,549,726,389.56
5. Step 5: Solve for x
   x = 1,005,549,726,389.56/1,145,436.97
6. Step 6: Final answer
   x = 877,874.34