Finding the Fourth Proportional to 63.34, 86.89 and 61.74

Step by Step Solution

1. Step 1: Write the proportion equation
   63.34 : 86.89 = 61.74 : x
2. Step 2: Convert to fraction form
   63.34/86.89 = 61.74/x
3. Step 3: Cross multiply
   63.34x = 86.89 × 61.74
4. Step 4: Simplify right side
   63.34x = 5,364.59
5. Step 5: Solve for x
   x = 5,364.59/63.34
6. Step 6: Final answer
   x = 84.70