Finding the Fourth Proportional to 8,131.74, 12,168.45 and 7,039.86

Step by Step Solution

1. Step 1: Write the proportion equation
   8,131.74 : 12,168.45 = 7,039.86 : x
2. Step 2: Convert to fraction form
   8,131.74/12,168.45 = 7,039.86/x
3. Step 3: Cross multiply
   8,131.74x = 12,168.45 × 7,039.86
4. Step 4: Simplify right side
   8,131.74x = 85,664,184.42
5. Step 5: Solve for x
   x = 85,664,184.42/8,131.74
6. Step 6: Final answer
   x = 10,534.55