Finding the Fourth Proportional to 118,508.72, 163,542.33 and 64,797.20

Step by Step Solution

1. Step 1: Write the proportion equation
   118,508.72 : 163,542.33 = 64,797.20 : x
2. Step 2: Convert to fraction form
   118,508.72/163,542.33 = 64,797.20/x
3. Step 3: Cross multiply
   118,508.72x = 163,542.33 × 64,797.20
4. Step 4: Simplify right side
   118,508.72x = 10,597,085,459.87
5. Step 5: Solve for x
   x = 10,597,085,459.87/118,508.72
6. Step 6: Final answer
   x = 89,420.30