Finding the Fourth Proportional to 2,123.90, 3,183.60 and 807.06

Step by Step Solution

1. Step 1: Write the proportion equation
   2,123.90 : 3,183.60 = 807.06 : x
2. Step 2: Convert to fraction form
   2,123.90/3,183.60 = 807.06/x
3. Step 3: Cross multiply
   2,123.90x = 3,183.60 × 807.06
4. Step 4: Simplify right side
   2,123.90x = 2,569,356.22
5. Step 5: Solve for x
   x = 2,569,356.22/2,123.90
6. Step 6: Final answer
   x = 1,209.74