Finding the Fourth Proportional to 99.78, 149.72 and 42.04

Step by Step Solution

1. Step 1: Write the proportion equation
   99.78 : 149.72 = 42.04 : x
2. Step 2: Convert to fraction form
   99.78/149.72 = 42.04/x
3. Step 3: Cross multiply
   99.78x = 149.72 × 42.04
4. Step 4: Simplify right side
   99.78x = 6,294.02
5. Step 5: Solve for x
   x = 6,294.02/99.78
6. Step 6: Final answer
   x = 63.08