Finding the Fourth Proportional to 12,931.71, 19,430.37 and 8,253.96

Step by Step Solution

1. Step 1: Write the proportion equation
   12,931.71 : 19,430.37 = 8,253.96 : x
2. Step 2: Convert to fraction form
   12,931.71/19,430.37 = 8,253.96/x
3. Step 3: Cross multiply
   12,931.71x = 19,430.37 × 8,253.96
4. Step 4: Simplify right side
   12,931.71x = 160,377,496.77
5. Step 5: Solve for x
   x = 160,377,496.77/12,931.71
6. Step 6: Final answer
   x = 12,401.88