Finding the Fourth Proportional to 31,787.72, 47,679.47 and 13,062.91

Step by Step Solution

1. Step 1: Write the proportion equation
   31,787.72 : 47,679.47 = 13,062.91 : x
2. Step 2: Convert to fraction form
   31,787.72/47,679.47 = 13,062.91/x
3. Step 3: Cross multiply
   31,787.72x = 47,679.47 × 13,062.91
4. Step 4: Simplify right side
   31,787.72x = 622,832,321.75
5. Step 5: Solve for x
   x = 622,832,321.75/31,787.72
6. Step 6: Final answer
   x = 19,593.49