Finding the Fourth Proportional to 66,498.68, 91,780.04 and 39,642.92

Step by Step Solution

1. Step 1: Write the proportion equation
   66,498.68 : 91,780.04 = 39,642.92 : x
2. Step 2: Convert to fraction form
   66,498.68/91,780.04 = 39,642.92/x
3. Step 3: Cross multiply
   66,498.68x = 91,780.04 × 39,642.92
4. Step 4: Simplify right side
   66,498.68x = 3,638,428,783.32
5. Step 5: Solve for x
   x = 3,638,428,783.32/66,498.68
6. Step 6: Final answer
   x = 54,714.30