Finding the Fourth Proportional to 101.69, 141.33 and 100.61

Step by Step Solution

1. Step 1: Write the proportion equation
   101.69 : 141.33 = 100.61 : x
2. Step 2: Convert to fraction form
   101.69/141.33 = 100.61/x
3. Step 3: Cross multiply
   101.69x = 141.33 × 100.61
4. Step 4: Simplify right side
   101.69x = 14,218.96
5. Step 5: Solve for x
   x = 14,218.96/101.69
6. Step 6: Final answer
   x = 139.83