Finding the Fourth Proportional to 12,680.32, 19,021.56 and 3,320.30

Step by Step Solution

1. Step 1: Write the proportion equation
   12,680.32 : 19,021.56 = 3,320.30 : x
2. Step 2: Convert to fraction form
   12,680.32/19,021.56 = 3,320.30/x
3. Step 3: Cross multiply
   12,680.32x = 19,021.56 × 3,320.30
4. Step 4: Simplify right side
   12,680.32x = 63,157,285.67
5. Step 5: Solve for x
   x = 63,157,285.67/12,680.32
6. Step 6: Final answer
   x = 4,980.73