Finding the Fourth Proportional to 72,436.70, 108,618.60 and 42,863.60

Step by Step Solution

1. Step 1: Write the proportion equation
   72,436.70 : 108,618.60 = 42,863.60 : x
2. Step 2: Convert to fraction form
   72,436.70/108,618.60 = 42,863.60/x
3. Step 3: Cross multiply
   72,436.70x = 108,618.60 × 42,863.60
4. Step 4: Simplify right side
   72,436.70x = 4,655,784,222.96
5. Step 5: Solve for x
   x = 4,655,784,222.96/72,436.70
6. Step 6: Final answer
   x = 64,273.83