Finding the Fourth Proportional to 8,931.86, 12,331.56 and 5,750.69

Step by Step Solution

1. Step 1: Write the proportion equation
   8,931.86 : 12,331.56 = 5,750.69 : x
2. Step 2: Convert to fraction form
   8,931.86/12,331.56 = 5,750.69/x
3. Step 3: Cross multiply
   8,931.86x = 12,331.56 × 5,750.69
4. Step 4: Simplify right side
   8,931.86x = 70,914,917.12
5. Step 5: Solve for x
   x = 70,914,917.12/8,931.86
6. Step 6: Final answer
   x = 7,939.55