Finding the Fourth Proportional to 72.99, 109.37 and 52.61

Step by Step Solution

1. Step 1: Write the proportion equation
   72.99 : 109.37 = 52.61 : x
2. Step 2: Convert to fraction form
   72.99/109.37 = 52.61/x
3. Step 3: Cross multiply
   72.99x = 109.37 × 52.61
4. Step 4: Simplify right side
   72.99x = 5,753.15
5. Step 5: Solve for x
   x = 5,753.15/72.99
6. Step 6: Final answer
   x = 78.82