Finding the Fourth Proportional to 101.72, 141.31 and 100.77

Step by Step Solution

1. Step 1: Write the proportion equation
   101.72 : 141.31 = 100.77 : x
2. Step 2: Convert to fraction form
   101.72/141.31 = 100.77/x
3. Step 3: Cross multiply
   101.72x = 141.31 × 100.77
4. Step 4: Simplify right side
   101.72x = 14,238.60
5. Step 5: Solve for x
   x = 14,238.60/101.72
6. Step 6: Final answer
   x = 139.99