Finding the Fourth Proportional to 2,142.74, 3,213.90 and 1,520.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,142.74 : 3,213.90 = 1,520.69 : x
2. Step 2: Convert to fraction form
   2,142.74/3,213.90 = 1,520.69/x
3. Step 3: Cross multiply
   2,142.74x = 3,213.90 × 1,520.69
4. Step 4: Simplify right side
   2,142.74x = 4,887,345.59
5. Step 5: Solve for x
   x = 4,887,345.59/2,142.74
6. Step 6: Final answer
   x = 2,280.89