Finding the Fourth Proportional to 1,152,576.88, 1,590,706.56 and 643,384.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,152,576.88 : 1,590,706.56 = 643,384.96 : x
2. Step 2: Convert to fraction form
   1,152,576.88/1,590,706.56 = 643,384.96/x
3. Step 3: Cross multiply
   1,152,576.88x = 1,590,706.56 × 643,384.96
4. Step 4: Simplify right side
   1,152,576.88x = 1,023,436,676,477.34
5. Step 5: Solve for x
   x = 1,023,436,676,477.34/1,152,576.88
6. Step 6: Final answer
   x = 887,955.24