Finding the Fourth Proportional to 2,142.60, 3,213.69 and 1,520.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,142.60 : 3,213.69 = 1,520.56 : x
2. Step 2: Convert to fraction form
   2,142.60/3,213.69 = 1,520.56/x
3. Step 3: Cross multiply
   2,142.60x = 3,213.69 × 1,520.56
4. Step 4: Simplify right side
   2,142.60x = 4,886,608.47
5. Step 5: Solve for x
   x = 4,886,608.47/2,142.60
6. Step 6: Final answer
   x = 2,280.69