Finding the Fourth Proportional to 21,819.72, 32,719.86 and 7,959

Step by Step Solution

1. Step 1: Write the proportion equation
   21,819.72 : 32,719.86 = 7,959 : x
2. Step 2: Convert to fraction form
   21,819.72/32,719.86 = 7,959/x
3. Step 3: Cross multiply
   21,819.72x = 32,719.86 × 7,959
4. Step 4: Simplify right side
   21,819.72x = 260,417,365.74
5. Step 5: Solve for x
   x = 260,417,365.74/21,819.72
6. Step 6: Final answer
   x = 11,934.95