Finding the Fourth Proportional to 2,349.61, 3,242.34 and 1,287.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,349.61 : 3,242.34 = 1,287.31 : x
2. Step 2: Convert to fraction form
   2,349.61/3,242.34 = 1,287.31/x
3. Step 3: Cross multiply
   2,349.61x = 3,242.34 × 1,287.31
4. Step 4: Simplify right side
   2,349.61x = 4,173,896.71
5. Step 5: Solve for x
   x = 4,173,896.71/2,349.61
6. Step 6: Final answer
   x = 1,776.42