Finding the Fourth Proportional to 1,359.31, 1,874.45 and 1,209.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,359.31 : 1,874.45 = 1,209.46 : x
2. Step 2: Convert to fraction form
   1,359.31/1,874.45 = 1,209.46/x
3. Step 3: Cross multiply
   1,359.31x = 1,874.45 × 1,209.46
4. Step 4: Simplify right side
   1,359.31x = 2,267,072.30
5. Step 5: Solve for x
   x = 2,267,072.30/1,359.31
6. Step 6: Final answer
   x = 1,667.81