Finding the Fourth Proportional to 118,647.72, 163,732.32 and 64,931.76

Step by Step Solution

1. Step 1: Write the proportion equation
   118,647.72 : 163,732.32 = 64,931.76 : x
2. Step 2: Convert to fraction form
   118,647.72/163,732.32 = 64,931.76/x
3. Step 3: Cross multiply
   118,647.72x = 163,732.32 × 64,931.76
4. Step 4: Simplify right side
   118,647.72x = 10,631,427,706.48
5. Step 5: Solve for x
   x = 10,631,427,706.48/118,647.72
6. Step 6: Final answer
   x = 89,604.99