Finding the Fourth Proportional to 123,237.28, 170,069.88 and 72,289

Step by Step Solution

1. Step 1: Write the proportion equation
   123,237.28 : 170,069.88 = 72,289 : x
2. Step 2: Convert to fraction form
   123,237.28/170,069.88 = 72,289/x
3. Step 3: Cross multiply
   123,237.28x = 170,069.88 × 72,289
4. Step 4: Simplify right side
   123,237.28x = 12,294,181,555.32
5. Step 5: Solve for x
   x = 12,294,181,555.32/123,237.28
6. Step 6: Final answer
   x = 99,760.25