Finding the Fourth Proportional to 54,411.33, 81,600.60 and 21,123.98

Step by Step Solution

1. Step 1: Write the proportion equation
   54,411.33 : 81,600.60 = 21,123.98 : x
2. Step 2: Convert to fraction form
   54,411.33/81,600.60 = 21,123.98/x
3. Step 3: Cross multiply
   54,411.33x = 81,600.60 × 21,123.98
4. Step 4: Simplify right side
   54,411.33x = 1,723,729,442.39
5. Step 5: Solve for x
   x = 1,723,729,442.39/54,411.33
6. Step 6: Final answer
   x = 31,679.61