Finding the Fourth Proportional to 10,539.38, 15,816.86 and 4,992.72

Step by Step Solution

1. Step 1: Write the proportion equation
   10,539.38 : 15,816.86 = 4,992.72 : x
2. Step 2: Convert to fraction form
   10,539.38/15,816.86 = 4,992.72/x
3. Step 3: Cross multiply
   10,539.38x = 15,816.86 × 4,992.72
4. Step 4: Simplify right side
   10,539.38x = 78,969,128.30
5. Step 5: Solve for x
   x = 78,969,128.30/10,539.38
6. Step 6: Final answer
   x = 7,492.77