Finding the Fourth Proportional to 118,509.72, 163,543.71 and 64,798.20

Step by Step Solution

1. Step 1: Write the proportion equation
   118,509.72 : 163,543.71 = 64,798.20 : x
2. Step 2: Convert to fraction form
   118,509.72/163,543.71 = 64,798.20/x
3. Step 3: Cross multiply
   118,509.72x = 163,543.71 × 64,798.20
4. Step 4: Simplify right side
   118,509.72x = 10,597,338,029.32
5. Step 5: Solve for x
   x = 10,597,338,029.32/118,509.72
6. Step 6: Final answer
   x = 89,421.68