Finding the Fourth Proportional to 118,618.72, 163,689.12 and 64,902.40

Step by Step Solution

1. Step 1: Write the proportion equation
   118,618.72 : 163,689.12 = 64,902.40 : x
2. Step 2: Convert to fraction form
   118,618.72/163,689.12 = 64,902.40/x
3. Step 3: Cross multiply
   118,618.72x = 163,689.12 × 64,902.40
4. Step 4: Simplify right side
   118,618.72x = 10,623,816,741.89
5. Step 5: Solve for x
   x = 10,623,816,741.89/118,618.72
6. Step 6: Final answer
   x = 89,562.73