Finding the Fourth Proportional to 147.50, 203.61 and 100.86

Step by Step Solution

1. Step 1: Write the proportion equation
   147.50 : 203.61 = 100.86 : x
2. Step 2: Convert to fraction form
   147.50/203.61 = 100.86/x
3. Step 3: Cross multiply
   147.50x = 203.61 × 100.86
4. Step 4: Simplify right side
   147.50x = 20,535.72
5. Step 5: Solve for x
   x = 20,535.72/147.50
6. Step 6: Final answer
   x = 139.23