Finding the Fourth Proportional to 23,173.98, 31,978.17 and 13,101.90

Step by Step Solution

1. Step 1: Write the proportion equation
   23,173.98 : 31,978.17 = 13,101.90 : x
2. Step 2: Convert to fraction form
   23,173.98/31,978.17 = 13,101.90/x
3. Step 3: Cross multiply
   23,173.98x = 31,978.17 × 13,101.90
4. Step 4: Simplify right side
   23,173.98x = 418,974,785.52
5. Step 5: Solve for x
   x = 418,974,785.52/23,173.98
6. Step 6: Final answer
   x = 18,079.54