Finding the Fourth Proportional to 72.91, 100.52 and 53.20

Step by Step Solution

1. Step 1: Write the proportion equation
   72.91 : 100.52 = 53.20 : x
2. Step 2: Convert to fraction form
   72.91/100.52 = 53.20/x
3. Step 3: Cross multiply
   72.91x = 100.52 × 53.20
4. Step 4: Simplify right side
   72.91x = 5,347.16
5. Step 5: Solve for x
   x = 5,347.16/72.91
6. Step 6: Final answer
   x = 73.34