Finding the Fourth Proportional to 89.30, 123.14 and 61.31

Step by Step Solution

1. Step 1: Write the proportion equation
   89.30 : 123.14 = 61.31 : x
2. Step 2: Convert to fraction form
   89.30/123.14 = 61.31/x
3. Step 3: Cross multiply
   89.30x = 123.14 × 61.31
4. Step 4: Simplify right side
   89.30x = 7,550.17
5. Step 5: Solve for x
   x = 7,550.17/89.30
6. Step 6: Final answer
   x = 84.55