Finding the Fourth Proportional to 54,436.43, 81,633.57 and 21,152.12

Step by Step Solution

1. Step 1: Write the proportion equation
   54,436.43 : 81,633.57 = 21,152.12 : x
2. Step 2: Convert to fraction form
   54,436.43/81,633.57 = 21,152.12/x
3. Step 3: Cross multiply
   54,436.43x = 81,633.57 × 21,152.12
4. Step 4: Simplify right side
   54,436.43x = 1,726,722,660.50
5. Step 5: Solve for x
   x = 1,726,722,660.50/54,436.43
6. Step 6: Final answer
   x = 31,719.99