Finding the Fourth Proportional to 118,728.72, 163,843.92 and 65,013.12

Step by Step Solution

1. Step 1: Write the proportion equation
   118,728.72 : 163,843.92 = 65,013.12 : x
2. Step 2: Convert to fraction form
   118,728.72/163,843.92 = 65,013.12/x
3. Step 3: Cross multiply
   118,728.72x = 163,843.92 × 65,013.12
4. Step 4: Simplify right side
   118,728.72x = 10,652,004,432.23
5. Step 5: Solve for x
   x = 10,652,004,432.23/118,728.72
6. Step 6: Final answer
   x = 89,717.17