Finding the Fourth Proportional to 8,470.72, 11,691.78 and 5,113.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,470.72 : 11,691.78 = 5,113.72 : x
2. Step 2: Convert to fraction form
   8,470.72/11,691.78 = 5,113.72/x
3. Step 3: Cross multiply
   8,470.72x = 11,691.78 × 5,113.72
4. Step 4: Simplify right side
   8,470.72x = 59,788,489.22
5. Step 5: Solve for x
   x = 59,788,489.22/8,470.72
6. Step 6: Final answer
   x = 7,058.25