Finding the Fourth Proportional to 118,354.56, 163,330.20 and 64,638.60

Step by Step Solution

1. Step 1: Write the proportion equation
   118,354.56 : 163,330.20 = 64,638.60 : x
2. Step 2: Convert to fraction form
   118,354.56/163,330.20 = 64,638.60/x
3. Step 3: Cross multiply
   118,354.56x = 163,330.20 × 64,638.60
4. Step 4: Simplify right side
   118,354.56x = 10,557,435,465.72
5. Step 5: Solve for x
   x = 10,557,435,465.72/118,354.56
6. Step 6: Final answer
   x = 89,201.76