Finding the Fourth Proportional to 89.88, 123.90 and 60.72

Step by Step Solution

1. Step 1: Write the proportion equation
   89.88 : 123.90 = 60.72 : x
2. Step 2: Convert to fraction form
   89.88/123.90 = 60.72/x
3. Step 3: Cross multiply
   89.88x = 123.90 × 60.72
4. Step 4: Simplify right side
   89.88x = 7,523.21
5. Step 5: Solve for x
   x = 7,523.21/89.88
6. Step 6: Final answer
   x = 83.70