Finding the Fourth Proportional to 123,291.20, 170,140.41 and 72,293.40

Step by Step Solution

1. Step 1: Write the proportion equation
   123,291.20 : 170,140.41 = 72,293.40 : x
2. Step 2: Convert to fraction form
   123,291.20/170,140.41 = 72,293.40/x
3. Step 3: Cross multiply
   123,291.20x = 170,140.41 × 72,293.40
4. Step 4: Simplify right side
   123,291.20x = 12,300,028,716.29
5. Step 5: Solve for x
   x = 12,300,028,716.29/123,291.20
6. Step 6: Final answer
   x = 99,764.05