Finding the Fourth Proportional to 131.90, 181.99 and 100.76

Step by Step Solution

1. Step 1: Write the proportion equation
   131.90 : 181.99 = 100.76 : x
2. Step 2: Convert to fraction form
   131.90/181.99 = 100.76/x
3. Step 3: Cross multiply
   131.90x = 181.99 × 100.76
4. Step 4: Simplify right side
   131.90x = 18,337.31
5. Step 5: Solve for x
   x = 18,337.31/131.90
6. Step 6: Final answer
   x = 139.02