Finding the Fourth Proportional to 1,853.61, 2,553.87 and 1,223.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,853.61 : 2,553.87 = 1,223.02 : x
2. Step 2: Convert to fraction form
   1,853.61/2,553.87 = 1,223.02/x
3. Step 3: Cross multiply
   1,853.61x = 2,553.87 × 1,223.02
4. Step 4: Simplify right side
   1,853.61x = 3,123,434.09
5. Step 5: Solve for x
   x = 3,123,434.09/1,853.61
6. Step 6: Final answer
   x = 1,685.06