Finding the Fourth Proportional to 1,725.78, 2,587.61 and 905.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,725.78 : 2,587.61 = 905.05 : x
2. Step 2: Convert to fraction form
   1,725.78/2,587.61 = 905.05/x
3. Step 3: Cross multiply
   1,725.78x = 2,587.61 × 905.05
4. Step 4: Simplify right side
   1,725.78x = 2,341,916.43
5. Step 5: Solve for x
   x = 2,341,916.43/1,725.78
6. Step 6: Final answer
   x = 1,357.02