Finding the Fourth Proportional to 72.50, 99.99 and 71.46

Step by Step Solution

1. Step 1: Write the proportion equation
   72.50 : 99.99 = 71.46 : x
2. Step 2: Convert to fraction form
   72.50/99.99 = 71.46/x
3. Step 3: Cross multiply
   72.50x = 99.99 × 71.46
4. Step 4: Simplify right side
   72.50x = 7,145.29
5. Step 5: Solve for x
   x = 7,145.29/72.50
6. Step 6: Final answer
   x = 98.56