Finding the Fourth Proportional to 123,610.83, 170,610.80 and 72,639.95

Step by Step Solution

1. Step 1: Write the proportion equation
   123,610.83 : 170,610.80 = 72,639.95 : x
2. Step 2: Convert to fraction form
   123,610.83/170,610.80 = 72,639.95/x
3. Step 3: Cross multiply
   123,610.83x = 170,610.80 × 72,639.95
4. Step 4: Simplify right side
   123,610.83x = 12,393,158,765.21
5. Step 5: Solve for x
   x = 12,393,158,765.21/123,610.83
6. Step 6: Final answer
   x = 100,259.49