Finding the Fourth Proportional to 1,590.33, 2,380.69 and 857.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,590.33 : 2,380.69 = 857.69 : x
2. Step 2: Convert to fraction form
   1,590.33/2,380.69 = 857.69/x
3. Step 3: Cross multiply
   1,590.33x = 2,380.69 × 857.69
4. Step 4: Simplify right side
   1,590.33x = 2,041,892.10
5. Step 5: Solve for x
   x = 2,041,892.10/1,590.33
6. Step 6: Final answer
   x = 1,283.94