Finding the Fourth Proportional to 12,817.42, 17,687.58 and 7,151.86

Step by Step Solution

1. Step 1: Write the proportion equation
   12,817.42 : 17,687.58 = 7,151.86 : x
2. Step 2: Convert to fraction form
   12,817.42/17,687.58 = 7,151.86/x
3. Step 3: Cross multiply
   12,817.42x = 17,687.58 × 7,151.86
4. Step 4: Simplify right side
   12,817.42x = 126,499,095.90
5. Step 5: Solve for x
   x = 126,499,095.90/12,817.42
6. Step 6: Final answer
   x = 9,869.31