Finding the Fourth Proportional to 1,782.69, 2,672.72 and 857.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,782.69 : 2,672.72 = 857.37 : x
2. Step 2: Convert to fraction form
   1,782.69/2,672.72 = 857.37/x
3. Step 3: Cross multiply
   1,782.69x = 2,672.72 × 857.37
4. Step 4: Simplify right side
   1,782.69x = 2,291,505.66
5. Step 5: Solve for x
   x = 2,291,505.66/1,782.69
6. Step 6: Final answer
   x = 1,285.42