Finding the Fourth Proportional to 825,499.25, 1,137,646.42 and 643,923.57

Step by Step Solution

1. Step 1: Write the proportion equation
   825,499.25 : 1,137,646.42 = 643,923.57 : x
2. Step 2: Convert to fraction form
   825,499.25/1,137,646.42 = 643,923.57/x
3. Step 3: Cross multiply
   825,499.25x = 1,137,646.42 × 643,923.57
4. Step 4: Simplify right side
   825,499.25x = 732,557,346,820.49
5. Step 5: Solve for x
   x = 732,557,346,820.49/825,499.25
6. Step 6: Final answer
   x = 887,411.28