Finding the Fourth Proportional to 131.91, 181.95 and 100.77

Step by Step Solution

1. Step 1: Write the proportion equation
   131.91 : 181.95 = 100.77 : x
2. Step 2: Convert to fraction form
   131.91/181.95 = 100.77/x
3. Step 3: Cross multiply
   131.91x = 181.95 × 100.77
4. Step 4: Simplify right side
   131.91x = 18,335.10
5. Step 5: Solve for x
   x = 18,335.10/131.91
6. Step 6: Final answer
   x = 139.00