Finding the Fourth Proportional to 1,404.31, 1,939.20 and 874.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,404.31 : 1,939.20 = 874.10 : x
2. Step 2: Convert to fraction form
   1,404.31/1,939.20 = 874.10/x
3. Step 3: Cross multiply
   1,404.31x = 1,939.20 × 874.10
4. Step 4: Simplify right side
   1,404.31x = 1,695,061.48
5. Step 5: Solve for x
   x = 1,695,061.48/1,404.31
6. Step 6: Final answer
   x = 1,207.04