Finding the Fourth Proportional to 118,258.57, 163,195.59 and 64,543.15

Step by Step Solution

1. Step 1: Write the proportion equation
   118,258.57 : 163,195.59 = 64,543.15 : x
2. Step 2: Convert to fraction form
   118,258.57/163,195.59 = 64,543.15/x
3. Step 3: Cross multiply
   118,258.57x = 163,195.59 × 64,543.15
4. Step 4: Simplify right side
   118,258.57x = 10,533,157,444.71
5. Step 5: Solve for x
   x = 10,533,157,444.71/118,258.57
6. Step 6: Final answer
   x = 89,068.87