Finding the Fourth Proportional to 93.34, 139.50 and 86.04

Step by Step Solution

1. Step 1: Write the proportion equation
   93.34 : 139.50 = 86.04 : x
2. Step 2: Convert to fraction form
   93.34/139.50 = 86.04/x
3. Step 3: Cross multiply
   93.34x = 139.50 × 86.04
4. Step 4: Simplify right side
   93.34x = 12,002.15
5. Step 5: Solve for x
   x = 12,002.15/93.34
6. Step 6: Final answer
   x = 128.59