Finding the Fourth Proportional to 99.78, 149.71 and 67.29

Step by Step Solution

1. Step 1: Write the proportion equation
   99.78 : 149.71 = 67.29 : x
2. Step 2: Convert to fraction form
   99.78/149.71 = 67.29/x
3. Step 3: Cross multiply
   99.78x = 149.71 × 67.29
4. Step 4: Simplify right side
   99.78x = 10,073.99
5. Step 5: Solve for x
   x = 10,073.99/99.78
6. Step 6: Final answer
   x = 100.96