Finding the Fourth Proportional to 9,139.10, 13,723.05 and 5,251.10

Step by Step Solution

1. Step 1: Write the proportion equation
   9,139.10 : 13,723.05 = 5,251.10 : x
2. Step 2: Convert to fraction form
   9,139.10/13,723.05 = 5,251.10/x
3. Step 3: Cross multiply
   9,139.10x = 13,723.05 × 5,251.10
4. Step 4: Simplify right side
   9,139.10x = 72,061,107.86
5. Step 5: Solve for x
   x = 72,061,107.86/9,139.10
6. Step 6: Final answer
   x = 7,884.92