Finding the Fourth Proportional to 1,152,588.69, 1,590,425.69 and 643,312.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,152,588.69 : 1,590,425.69 = 643,312.53 : x
2. Step 2: Convert to fraction form
   1,152,588.69/1,590,425.69 = 643,312.53/x
3. Step 3: Cross multiply
   1,152,588.69x = 1,590,425.69 × 643,312.53
4. Step 4: Simplify right side
   1,152,588.69x = 1,023,140,771,194.33
5. Step 5: Solve for x
   x = 1,023,140,771,194.33/1,152,588.69
6. Step 6: Final answer
   x = 887,689.41