Finding the Fourth Proportional to 65,218.77, 89,978.04 and 39,714.71

Step by Step Solution

1. Step 1: Write the proportion equation
   65,218.77 : 89,978.04 = 39,714.71 : x
2. Step 2: Convert to fraction form
   65,218.77/89,978.04 = 39,714.71/x
3. Step 3: Cross multiply
   65,218.77x = 89,978.04 × 39,714.71
4. Step 4: Simplify right side
   65,218.77x = 3,573,451,315.08
5. Step 5: Solve for x
   x = 3,573,451,315.08/65,218.77
6. Step 6: Final answer
   x = 54,791.76