Finding the Fourth Proportional to 99.72, 149.34 and 51.50

Step by Step Solution

1. Step 1: Write the proportion equation
   99.72 : 149.34 = 51.50 : x
2. Step 2: Convert to fraction form
   99.72/149.34 = 51.50/x
3. Step 3: Cross multiply
   99.72x = 149.34 × 51.50
4. Step 4: Simplify right side
   99.72x = 7,691.01
5. Step 5: Solve for x
   x = 7,691.01/99.72
6. Step 6: Final answer
   x = 77.13