Finding the Fourth Proportional to 10,540.72, 15,811.36 and 4,992.72

Step by Step Solution

1. Step 1: Write the proportion equation
   10,540.72 : 15,811.36 = 4,992.72 : x
2. Step 2: Convert to fraction form
   10,540.72/15,811.36 = 4,992.72/x
3. Step 3: Cross multiply
   10,540.72x = 15,811.36 × 4,992.72
4. Step 4: Simplify right side
   10,540.72x = 78,941,693.30
5. Step 5: Solve for x
   x = 78,941,693.30/10,540.72
6. Step 6: Final answer
   x = 7,489.21