Finding the Fourth Proportional to 118,411.86, 163,410.72 and 64,700.20

Step by Step Solution

1. Step 1: Write the proportion equation
   118,411.86 : 163,410.72 = 64,700.20 : x
2. Step 2: Convert to fraction form
   118,411.86/163,410.72 = 64,700.20/x
3. Step 3: Cross multiply
   118,411.86x = 163,410.72 × 64,700.20
4. Step 4: Simplify right side
   118,411.86x = 10,572,705,449.09
5. Step 5: Solve for x
   x = 10,572,705,449.09/118,411.86
6. Step 6: Final answer
   x = 89,287.55