Finding the Fourth Proportional to 94.02, 140.67 and 86.10

Step by Step Solution

1. Step 1: Write the proportion equation
   94.02 : 140.67 = 86.10 : x
2. Step 2: Convert to fraction form
   94.02/140.67 = 86.10/x
3. Step 3: Cross multiply
   94.02x = 140.67 × 86.10
4. Step 4: Simplify right side
   94.02x = 12,111.69
5. Step 5: Solve for x
   x = 12,111.69/94.02
6. Step 6: Final answer
   x = 128.82