Finding the Fourth Proportional to 72.22, 99.42 and 53.74

Step by Step Solution

1. Step 1: Write the proportion equation
   72.22 : 99.42 = 53.74 : x
2. Step 2: Convert to fraction form
   72.22/99.42 = 53.74/x
3. Step 3: Cross multiply
   72.22x = 99.42 × 53.74
4. Step 4: Simplify right side
   72.22x = 5,342.83
5. Step 5: Solve for x
   x = 5,342.83/72.22
6. Step 6: Final answer
   x = 73.98