Finding the Fourth Proportional to 72.61, 109.43 and 71.98

Step by Step Solution

1. Step 1: Write the proportion equation
   72.61 : 109.43 = 71.98 : x
2. Step 2: Convert to fraction form
   72.61/109.43 = 71.98/x
3. Step 3: Cross multiply
   72.61x = 109.43 × 71.98
4. Step 4: Simplify right side
   72.61x = 7,876.59
5. Step 5: Solve for x
   x = 7,876.59/72.61
6. Step 6: Final answer
   x = 108.48