Finding the Fourth Proportional to 72.47, 99.99 and 54.02

Step by Step Solution

1. Step 1: Write the proportion equation
   72.47 : 99.99 = 54.02 : x
2. Step 2: Convert to fraction form
   72.47/99.99 = 54.02/x
3. Step 3: Cross multiply
   72.47x = 99.99 × 54.02
4. Step 4: Simplify right side
   72.47x = 5,401.71
5. Step 5: Solve for x
   x = 5,401.71/72.47
6. Step 6: Final answer
   x = 74.53