Finding the Fourth Proportional to 123,899.20, 170,978.88 and 67,311.52

Step by Step Solution

1. Step 1: Write the proportion equation
   123,899.20 : 170,978.88 = 67,311.52 : x
2. Step 2: Convert to fraction form
   123,899.20/170,978.88 = 67,311.52/x
3. Step 3: Cross multiply
   123,899.20x = 170,978.88 × 67,311.52
4. Step 4: Simplify right side
   123,899.20x = 11,508,848,300.70
5. Step 5: Solve for x
   x = 11,508,848,300.70/123,899.20
6. Step 6: Final answer
   x = 92,888.80