Finding the Fourth Proportional to 150.01, 206.89 and 100.78

Step by Step Solution

1. Step 1: Write the proportion equation
   150.01 : 206.89 = 100.78 : x
2. Step 2: Convert to fraction form
   150.01/206.89 = 100.78/x
3. Step 3: Cross multiply
   150.01x = 206.89 × 100.78
4. Step 4: Simplify right side
   150.01x = 20,850.37
5. Step 5: Solve for x
   x = 20,850.37/150.01
6. Step 6: Final answer
   x = 138.99