Finding the Fourth Proportional to 1,545.33, 2,319.89 and 815.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,545.33 : 2,319.89 = 815.34 : x
2. Step 2: Convert to fraction form
   1,545.33/2,319.89 = 815.34/x
3. Step 3: Cross multiply
   1,545.33x = 2,319.89 × 815.34
4. Step 4: Simplify right side
   1,545.33x = 1,891,495.04
5. Step 5: Solve for x
   x = 1,891,495.04/1,545.33
6. Step 6: Final answer
   x = 1,224.01