Finding the Fourth Proportional to 39,872.12, 55,023.27 and 21,966.71

Step by Step Solution

1. Step 1: Write the proportion equation
   39,872.12 : 55,023.27 = 21,966.71 : x
2. Step 2: Convert to fraction form
   39,872.12/55,023.27 = 21,966.71/x
3. Step 3: Cross multiply
   39,872.12x = 55,023.27 × 21,966.71
4. Step 4: Simplify right side
   39,872.12x = 1,208,680,215.34
5. Step 5: Solve for x
   x = 1,208,680,215.34/39,872.12
6. Step 6: Final answer
   x = 30,313.92