Finding the Fourth Proportional to 23,172.15, 31,977.81 and 13,100.70

Step by Step Solution

1. Step 1: Write the proportion equation
   23,172.15 : 31,977.81 = 13,100.70 : x
2. Step 2: Convert to fraction form
   23,172.15/31,977.81 = 13,100.70/x
3. Step 3: Cross multiply
   23,172.15x = 31,977.81 × 13,100.70
4. Step 4: Simplify right side
   23,172.15x = 418,931,695.47
5. Step 5: Solve for x
   x = 418,931,695.47/23,172.15
6. Step 6: Final answer
   x = 18,079.10