Finding the Fourth Proportional to 100.72, 150.98 and 42.99

Step by Step Solution

1. Step 1: Write the proportion equation
   100.72 : 150.98 = 42.99 : x
2. Step 2: Convert to fraction form
   100.72/150.98 = 42.99/x
3. Step 3: Cross multiply
   100.72x = 150.98 × 42.99
4. Step 4: Simplify right side
   100.72x = 6,490.74
5. Step 5: Solve for x
   x = 6,490.74/100.72
6. Step 6: Final answer
   x = 64.44