Finding the Fourth Proportional to 89.61, 123.58 and 61.93

Step by Step Solution

1. Step 1: Write the proportion equation
   89.61 : 123.58 = 61.93 : x
2. Step 2: Convert to fraction form
   89.61/123.58 = 61.93/x
3. Step 3: Cross multiply
   89.61x = 123.58 × 61.93
4. Step 4: Simplify right side
   89.61x = 7,653.31
5. Step 5: Solve for x
   x = 7,653.31/89.61
6. Step 6: Final answer
   x = 85.41