Finding the Fourth Proportional to 1,209.20, 1,810.69 and 1,003.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,209.20 : 1,810.69 = 1,003.15 : x
2. Step 2: Convert to fraction form
   1,209.20/1,810.69 = 1,003.15/x
3. Step 3: Cross multiply
   1,209.20x = 1,810.69 × 1,003.15
4. Step 4: Simplify right side
   1,209.20x = 1,816,393.43
5. Step 5: Solve for x
   x = 1,816,393.43/1,209.20
6. Step 6: Final answer
   x = 1,502.15