Finding the Fourth Proportional to 10,117.58, 15,149.61 and 7,139.81

Step by Step Solution

1. Step 1: Write the proportion equation
   10,117.58 : 15,149.61 = 7,139.81 : x
2. Step 2: Convert to fraction form
   10,117.58/15,149.61 = 7,139.81/x
3. Step 3: Cross multiply
   10,117.58x = 15,149.61 × 7,139.81
4. Step 4: Simplify right side
   10,117.58x = 108,165,374.85
5. Step 5: Solve for x
   x = 108,165,374.85/10,117.58
6. Step 6: Final answer
   x = 10,690.84