Finding the Fourth Proportional to 31,522.72, 47,253.84 and 13,990.72

Step by Step Solution

1. Step 1: Write the proportion equation
   31,522.72 : 47,253.84 = 13,990.72 : x
2. Step 2: Convert to fraction form
   31,522.72/47,253.84 = 13,990.72/x
3. Step 3: Cross multiply
   31,522.72x = 47,253.84 × 13,990.72
4. Step 4: Simplify right side
   31,522.72x = 661,115,244.36
5. Step 5: Solve for x
   x = 661,115,244.36/31,522.72
6. Step 6: Final answer
   x = 20,972.66