Finding the Fourth Proportional to 99.72, 149.51 and 69.30

Step by Step Solution

1. Step 1: Write the proportion equation
   99.72 : 149.51 = 69.30 : x
2. Step 2: Convert to fraction form
   99.72/149.51 = 69.30/x
3. Step 3: Cross multiply
   99.72x = 149.51 × 69.30
4. Step 4: Simplify right side
   99.72x = 10,361.04
5. Step 5: Solve for x
   x = 10,361.04/99.72
6. Step 6: Final answer
   x = 103.90