Finding the Fourth Proportional to 71.99, 99.39 and 51.29

Step by Step Solution

1. Step 1: Write the proportion equation
   71.99 : 99.39 = 51.29 : x
2. Step 2: Convert to fraction form
   71.99/99.39 = 51.29/x
3. Step 3: Cross multiply
   71.99x = 99.39 × 51.29
4. Step 4: Simplify right side
   71.99x = 5,097.96
5. Step 5: Solve for x
   x = 5,097.96/71.99
6. Step 6: Final answer
   x = 70.81