Finding the Fourth Proportional to 31,660.30, 47,472.89 and 12,953.45

Step by Step Solution

1. Step 1: Write the proportion equation
   31,660.30 : 47,472.89 = 12,953.45 : x
2. Step 2: Convert to fraction form
   31,660.30/47,472.89 = 12,953.45/x
3. Step 3: Cross multiply
   31,660.30x = 47,472.89 × 12,953.45
4. Step 4: Simplify right side
   31,660.30x = 614,937,760.89
5. Step 5: Solve for x
   x = 614,937,760.89/31,660.30
6. Step 6: Final answer
   x = 19,422.99