Finding the Fourth Proportional to 1,152,578.88, 1,590,709.32 and 643,386.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,152,578.88 : 1,590,709.32 = 643,386.96 : x
2. Step 2: Convert to fraction form
   1,152,578.88/1,590,709.32 = 643,386.96/x
3. Step 3: Cross multiply
   1,152,578.88x = 1,590,709.32 × 643,386.96
4. Step 4: Simplify right side
   1,152,578.88x = 1,023,441,633,638.47
5. Step 5: Solve for x
   x = 1,023,441,633,638.47/1,152,578.88
6. Step 6: Final answer
   x = 887,958.00