Finding the Fourth Proportional to 63,680.28, 87,879.32 and 39,820.79

Step by Step Solution

1. Step 1: Write the proportion equation
   63,680.28 : 87,879.32 = 39,820.79 : x
2. Step 2: Convert to fraction form
   63,680.28/87,879.32 = 39,820.79/x
3. Step 3: Cross multiply
   63,680.28x = 87,879.32 × 39,820.79
4. Step 4: Simplify right side
   63,680.28x = 3,499,423,308.56
5. Step 5: Solve for x
   x = 3,499,423,308.56/63,680.28
6. Step 6: Final answer
   x = 54,953.01