Finding the Fourth Proportional to 93.29, 139.59 and 86.00

Step by Step Solution

1. Step 1: Write the proportion equation
   93.29 : 139.59 = 86.00 : x
2. Step 2: Convert to fraction form
   93.29/139.59 = 86.00/x
3. Step 3: Cross multiply
   93.29x = 139.59 × 86.00
4. Step 4: Simplify right side
   93.29x = 12,004.04
5. Step 5: Solve for x
   x = 12,004.04/93.29
6. Step 6: Final answer
   x = 128.68