Finding the Fourth Proportional to 7,819.72, 11,721.38 and 5,736.60

Step by Step Solution

1. Step 1: Write the proportion equation
   7,819.72 : 11,721.38 = 5,736.60 : x
2. Step 2: Convert to fraction form
   7,819.72/11,721.38 = 5,736.60/x
3. Step 3: Cross multiply
   7,819.72x = 11,721.38 × 5,736.60
4. Step 4: Simplify right side
   7,819.72x = 67,240,839.83
5. Step 5: Solve for x
   x = 67,240,839.83/7,819.72
6. Step 6: Final answer
   x = 8,598.88