Finding the Fourth Proportional to 1,807.71, 2,494.31 and 1,021.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,807.71 : 2,494.31 = 1,021.61 : x
2. Step 2: Convert to fraction form
   1,807.71/2,494.31 = 1,021.61/x
3. Step 3: Cross multiply
   1,807.71x = 2,494.31 × 1,021.61
4. Step 4: Simplify right side
   1,807.71x = 2,548,194.46
5. Step 5: Solve for x
   x = 2,548,194.46/1,807.71
6. Step 6: Final answer
   x = 1,409.63