Finding the Fourth Proportional to 54,665.64, 81,981.18 and 17,721

Step by Step Solution

1. Step 1: Write the proportion equation
   54,665.64 : 81,981.18 = 17,721 : x
2. Step 2: Convert to fraction form
   54,665.64/81,981.18 = 17,721/x
3. Step 3: Cross multiply
   54,665.64x = 81,981.18 × 17,721
4. Step 4: Simplify right side
   54,665.64x = 1,452,788,490.78
5. Step 5: Solve for x
   x = 1,452,788,490.78/54,665.64
6. Step 6: Final answer
   x = 26,575.90