Finding the Fourth Proportional to 118,403.06, 163,397.67 and 64,688.72

Step by Step Solution

1. Step 1: Write the proportion equation
   118,403.06 : 163,397.67 = 64,688.72 : x
2. Step 2: Convert to fraction form
   118,403.06/163,397.67 = 64,688.72/x
3. Step 3: Cross multiply
   118,403.06x = 163,397.67 × 64,688.72
4. Step 4: Simplify right side
   118,403.06x = 10,569,986,123.28
5. Step 5: Solve for x
   x = 10,569,986,123.28/118,403.06
6. Step 6: Final answer
   x = 89,271.22