Finding the Fourth Proportional to 100.69, 151.05 and 42.88

Step by Step Solution

1. Step 1: Write the proportion equation
   100.69 : 151.05 = 42.88 : x
2. Step 2: Convert to fraction form
   100.69/151.05 = 42.88/x
3. Step 3: Cross multiply
   100.69x = 151.05 × 42.88
4. Step 4: Simplify right side
   100.69x = 6,476.27
5. Step 5: Solve for x
   x = 6,476.27/100.69
6. Step 6: Final answer
   x = 64.32