Finding the Fourth Proportional to 2,287.02, 3,156.06 and 1,239.07

Step by Step Solution

1. Step 1: Write the proportion equation
   2,287.02 : 3,156.06 = 1,239.07 : x
2. Step 2: Convert to fraction form
   2,287.02/3,156.06 = 1,239.07/x
3. Step 3: Cross multiply
   2,287.02x = 3,156.06 × 1,239.07
4. Step 4: Simplify right side
   2,287.02x = 3,910,579.26
5. Step 5: Solve for x
   x = 3,910,579.26/2,287.02
6. Step 6: Final answer
   x = 1,709.90