Finding the Fourth Proportional to 21,315.76, 31,976.56 and 7,272.02

Step by Step Solution

1. Step 1: Write the proportion equation
   21,315.76 : 31,976.56 = 7,272.02 : x
2. Step 2: Convert to fraction form
   21,315.76/31,976.56 = 7,272.02/x
3. Step 3: Cross multiply
   21,315.76x = 31,976.56 × 7,272.02
4. Step 4: Simplify right side
   21,315.76x = 232,534,182.95
5. Step 5: Solve for x
   x = 232,534,182.95/21,315.76
6. Step 6: Final answer
   x = 10,909.02