Finding the Fourth Proportional to 9,142.72, 12,616.70 and 5,416.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,142.72 : 12,616.70 = 5,416.72 : x
2. Step 2: Convert to fraction form
   9,142.72/12,616.70 = 5,416.72/x
3. Step 3: Cross multiply
   9,142.72x = 12,616.70 × 5,416.72
4. Step 4: Simplify right side
   9,142.72x = 68,341,131.22
5. Step 5: Solve for x
   x = 68,341,131.22/9,142.72
6. Step 6: Final answer
   x = 7,474.92