Finding the Fourth Proportional to 99.78, 149.55 and 34.72

Step by Step Solution

1. Step 1: Write the proportion equation
   99.78 : 149.55 = 34.72 : x
2. Step 2: Convert to fraction form
   99.78/149.55 = 34.72/x
3. Step 3: Cross multiply
   99.78x = 149.55 × 34.72
4. Step 4: Simplify right side
   99.78x = 5,192.38
5. Step 5: Solve for x
   x = 5,192.38/99.78
6. Step 6: Final answer
   x = 52.04