Finding the Fourth Proportional to 118,644.72, 163,728.18 and 64,928.76

Step by Step Solution

1. Step 1: Write the proportion equation
   118,644.72 : 163,728.18 = 64,928.76 : x
2. Step 2: Convert to fraction form
   118,644.72/163,728.18 = 64,928.76/x
3. Step 3: Cross multiply
   118,644.72x = 163,728.18 × 64,928.76
4. Step 4: Simplify right side
   118,644.72x = 10,630,667,704.46
5. Step 5: Solve for x
   x = 10,630,667,704.46/118,644.72
6. Step 6: Final answer
   x = 89,600.85