Finding the Fourth Proportional to 10,887.68, 16,329.12 and 3,490.72

Step by Step Solution

1. Step 1: Write the proportion equation
   10,887.68 : 16,329.12 = 3,490.72 : x
2. Step 2: Convert to fraction form
   10,887.68/16,329.12 = 3,490.72/x
3. Step 3: Cross multiply
   10,887.68x = 16,329.12 × 3,490.72
4. Step 4: Simplify right side
   10,887.68x = 57,000,385.77
5. Step 5: Solve for x
   x = 57,000,385.77/10,887.68
6. Step 6: Final answer
   x = 5,235.31