Finding the Fourth Proportional to 72.63, 100.28 and 53.31

Step by Step Solution

1. Step 1: Write the proportion equation
   72.63 : 100.28 = 53.31 : x
2. Step 2: Convert to fraction form
   72.63/100.28 = 53.31/x
3. Step 3: Cross multiply
   72.63x = 100.28 × 53.31
4. Step 4: Simplify right side
   72.63x = 5,345.66
5. Step 5: Solve for x
   x = 5,345.66/72.63
6. Step 6: Final answer
   x = 73.60