Finding the Fourth Proportional to 123,408.61, 170,320.78 and 71,019.49

Step by Step Solution

1. Step 1: Write the proportion equation
   123,408.61 : 170,320.78 = 71,019.49 : x
2. Step 2: Convert to fraction form
   123,408.61/170,320.78 = 71,019.49/x
3. Step 3: Cross multiply
   123,408.61x = 170,320.78 × 71,019.49
4. Step 4: Simplify right side
   123,408.61x = 12,096,094,932.00
5. Step 5: Solve for x
   x = 12,096,094,932.00/123,408.61
6. Step 6: Final answer
   x = 98,016.62