Finding the Fourth Proportional to 123,618.32, 170,615.12 and 72,631.04

Step by Step Solution

1. Step 1: Write the proportion equation
   123,618.32 : 170,615.12 = 72,631.04 : x
2. Step 2: Convert to fraction form
   123,618.32/170,615.12 = 72,631.04/x
3. Step 3: Cross multiply
   123,618.32x = 170,615.12 × 72,631.04
4. Step 4: Simplify right side
   123,618.32x = 12,391,953,605.32
5. Step 5: Solve for x
   x = 12,391,953,605.32/123,618.32
6. Step 6: Final answer
   x = 100,243.67