Finding the Fourth Proportional to 5,315.78, 7,335.42 and 3,219.50

Step by Step Solution

1. Step 1: Write the proportion equation
   5,315.78 : 7,335.42 = 3,219.50 : x
2. Step 2: Convert to fraction form
   5,315.78/7,335.42 = 3,219.50/x
3. Step 3: Cross multiply
   5,315.78x = 7,335.42 × 3,219.50
4. Step 4: Simplify right side
   5,315.78x = 23,616,384.69
5. Step 5: Solve for x
   x = 23,616,384.69/5,315.78
6. Step 6: Final answer
   x = 4,442.69