Finding the Fourth Proportional to 31,081.72, 42,895.87 and 18,981.53

Step by Step Solution

1. Step 1: Write the proportion equation
   31,081.72 : 42,895.87 = 18,981.53 : x
2. Step 2: Convert to fraction form
   31,081.72/42,895.87 = 18,981.53/x
3. Step 3: Cross multiply
   31,081.72x = 42,895.87 × 18,981.53
4. Step 4: Simplify right side
   31,081.72x = 814,229,243.28
5. Step 5: Solve for x
   x = 814,229,243.28/31,081.72
6. Step 6: Final answer
   x = 26,196.40