Finding the Fourth Proportional to 825,978.90, 1,139,868.42 and 463,428.98

Step by Step Solution

1. Step 1: Write the proportion equation
   825,978.90 : 1,139,868.42 = 463,428.98 : x
2. Step 2: Convert to fraction form
   825,978.90/1,139,868.42 = 463,428.98/x
3. Step 3: Cross multiply
   825,978.90x = 1,139,868.42 × 463,428.98
4. Step 4: Simplify right side
   825,978.90x = 528,248,053,515.47
5. Step 5: Solve for x
   x = 528,248,053,515.47/825,978.90
6. Step 6: Final answer
   x = 639,541.83