Finding the Fourth Proportional to 89.86, 124.06 and 61.88

Step by Step Solution

1. Step 1: Write the proportion equation
   89.86 : 124.06 = 61.88 : x
2. Step 2: Convert to fraction form
   89.86/124.06 = 61.88/x
3. Step 3: Cross multiply
   89.86x = 124.06 × 61.88
4. Step 4: Simplify right side
   89.86x = 7,676.83
5. Step 5: Solve for x
   x = 7,676.83/89.86
6. Step 6: Final answer
   x = 85.43