Finding the Fourth Proportional to 100.80, 137.25 and 100.26

Step by Step Solution

1. Step 1: Write the proportion equation
   100.80 : 137.25 = 100.26 : x
2. Step 2: Convert to fraction form
   100.80/137.25 = 100.26/x
3. Step 3: Cross multiply
   100.80x = 137.25 × 100.26
4. Step 4: Simplify right side
   100.80x = 13,760.69
5. Step 5: Solve for x
   x = 13,760.69/100.80
6. Step 6: Final answer
   x = 136.51