Finding the Fourth Proportional to 8,606.86, 12,931.92 and 5,488.30

Step by Step Solution

1. Step 1: Write the proportion equation
   8,606.86 : 12,931.92 = 5,488.30 : x
2. Step 2: Convert to fraction form
   8,606.86/12,931.92 = 5,488.30/x
3. Step 3: Cross multiply
   8,606.86x = 12,931.92 × 5,488.30
4. Step 4: Simplify right side
   8,606.86x = 70,974,256.54
5. Step 5: Solve for x
   x = 70,974,256.54/8,606.86
6. Step 6: Final answer
   x = 8,246.24