Finding the Fourth Proportional to 101.86, 152.06 and 86.48

Step by Step Solution

1. Step 1: Write the proportion equation
   101.86 : 152.06 = 86.48 : x
2. Step 2: Convert to fraction form
   101.86/152.06 = 86.48/x
3. Step 3: Cross multiply
   101.86x = 152.06 × 86.48
4. Step 4: Simplify right side
   101.86x = 13,150.15
5. Step 5: Solve for x
   x = 13,150.15/101.86
6. Step 6: Final answer
   x = 129.10