Finding the Fourth Proportional to 123,889.28, 170,952.69 and 72,890.79

Step by Step Solution

1. Step 1: Write the proportion equation
   123,889.28 : 170,952.69 = 72,890.79 : x
2. Step 2: Convert to fraction form
   123,889.28/170,952.69 = 72,890.79/x
3. Step 3: Cross multiply
   123,889.28x = 170,952.69 × 72,890.79
4. Step 4: Simplify right side
   123,889.28x = 12,460,876,626.73
5. Step 5: Solve for x
   x = 12,460,876,626.73/123,889.28
6. Step 6: Final answer
   x = 100,580.75