Finding the Fourth Proportional to 123,479.20, 170,404.08 and 72,506.56

Step by Step Solution

1. Step 1: Write the proportion equation
   123,479.20 : 170,404.08 = 72,506.56 : x
2. Step 2: Convert to fraction form
   123,479.20/170,404.08 = 72,506.56/x
3. Step 3: Cross multiply
   123,479.20x = 170,404.08 × 72,506.56
4. Step 4: Simplify right side
   123,479.20x = 12,355,413,650.76
5. Step 5: Solve for x
   x = 12,355,413,650.76/123,479.20
6. Step 6: Final answer
   x = 100,060.69