Finding the Fourth Proportional to 39,887.98, 55,042.50 and 21,981.94

Step by Step Solution

1. Step 1: Write the proportion equation
   39,887.98 : 55,042.50 = 21,981.94 : x
2. Step 2: Convert to fraction form
   39,887.98/55,042.50 = 21,981.94/x
3. Step 3: Cross multiply
   39,887.98x = 55,042.50 × 21,981.94
4. Step 4: Simplify right side
   39,887.98x = 1,209,940,932.45
5. Step 5: Solve for x
   x = 1,209,940,932.45/39,887.98
6. Step 6: Final answer
   x = 30,333.47