Finding the Fourth Proportional to 100.42, 150.62 and 91.30

Step by Step Solution

1. Step 1: Write the proportion equation
   100.42 : 150.62 = 91.30 : x
2. Step 2: Convert to fraction form
   100.42/150.62 = 91.30/x
3. Step 3: Cross multiply
   100.42x = 150.62 × 91.30
4. Step 4: Simplify right side
   100.42x = 13,751.61
5. Step 5: Solve for x
   x = 13,751.61/100.42
6. Step 6: Final answer
   x = 136.94