Finding the Fourth Proportional to 118,443.39, 163,451.49 and 64,728.72

Step by Step Solution

1. Step 1: Write the proportion equation
   118,443.39 : 163,451.49 = 64,728.72 : x
2. Step 2: Convert to fraction form
   118,443.39/163,451.49 = 64,728.72/x
3. Step 3: Cross multiply
   118,443.39x = 163,451.49 × 64,728.72
4. Step 4: Simplify right side
   118,443.39x = 10,580,005,729.79
5. Step 5: Solve for x
   x = 10,580,005,729.79/118,443.39
6. Step 6: Final answer
   x = 89,325.42