Finding the Fourth Proportional to 23,139.76, 31,933.16 and 13,706.50

Step by Step Solution

1. Step 1: Write the proportion equation
   23,139.76 : 31,933.16 = 13,706.50 : x
2. Step 2: Convert to fraction form
   23,139.76/31,933.16 = 13,706.50/x
3. Step 3: Cross multiply
   23,139.76x = 31,933.16 × 13,706.50
4. Step 4: Simplify right side
   23,139.76x = 437,691,857.54
5. Step 5: Solve for x
   x = 437,691,857.54/23,139.76
6. Step 6: Final answer
   x = 18,915.14