Finding the Fourth Proportional to 72.83, 109.23 and 21.47

Step by Step Solution

1. Step 1: Write the proportion equation
   72.83 : 109.23 = 21.47 : x
2. Step 2: Convert to fraction form
   72.83/109.23 = 21.47/x
3. Step 3: Cross multiply
   72.83x = 109.23 × 21.47
4. Step 4: Simplify right side
   72.83x = 2,345.17
5. Step 5: Solve for x
   x = 2,345.17/72.83
6. Step 6: Final answer
   x = 32.20