Finding the Fourth Proportional to 9,116.74, 12,581.01 and 5,139.13

Step by Step Solution

1. Step 1: Write the proportion equation
   9,116.74 : 12,581.01 = 5,139.13 : x
2. Step 2: Convert to fraction form
   9,116.74/12,581.01 = 5,139.13/x
3. Step 3: Cross multiply
   9,116.74x = 12,581.01 × 5,139.13
4. Step 4: Simplify right side
   9,116.74x = 64,655,445.92
5. Step 5: Solve for x
   x = 64,655,445.92/9,116.74
6. Step 6: Final answer
   x = 7,091.95