Finding the Fourth Proportional to 39,756.32, 54,864.72 and 21,851.76

Step by Step Solution

1. Step 1: Write the proportion equation
   39,756.32 : 54,864.72 = 21,851.76 : x
2. Step 2: Convert to fraction form
   39,756.32/54,864.72 = 21,851.76/x
3. Step 3: Cross multiply
   39,756.32x = 54,864.72 × 21,851.76
4. Step 4: Simplify right side
   39,756.32x = 1,198,890,693.91
5. Step 5: Solve for x
   x = 1,198,890,693.91/39,756.32
6. Step 6: Final answer
   x = 30,155.98