Finding the Fourth Proportional to 1,573.02, 2,161.89 and 1,223.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,573.02 : 2,161.89 = 1,223.10 : x
2. Step 2: Convert to fraction form
   1,573.02/2,161.89 = 1,223.10/x
3. Step 3: Cross multiply
   1,573.02x = 2,161.89 × 1,223.10
4. Step 4: Simplify right side
   1,573.02x = 2,644,207.66
5. Step 5: Solve for x
   x = 2,644,207.66/1,573.02
6. Step 6: Final answer
   x = 1,680.98