Finding the Fourth Proportional to 74.31, 111.98 and 72.69

Step by Step Solution

1. Step 1: Write the proportion equation
   74.31 : 111.98 = 72.69 : x
2. Step 2: Convert to fraction form
   74.31/111.98 = 72.69/x
3. Step 3: Cross multiply
   74.31x = 111.98 × 72.69
4. Step 4: Simplify right side
   74.31x = 8,139.46
5. Step 5: Solve for x
   x = 8,139.46/74.31
6. Step 6: Final answer
   x = 109.53