Finding the Fourth Proportional to 1,555.69, 2,146.89 and 857.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,555.69 : 2,146.89 = 857.07 : x
2. Step 2: Convert to fraction form
   1,555.69/2,146.89 = 857.07/x
3. Step 3: Cross multiply
   1,555.69x = 2,146.89 × 857.07
4. Step 4: Simplify right side
   1,555.69x = 1,840,035.01
5. Step 5: Solve for x
   x = 1,840,035.01/1,555.69
6. Step 6: Final answer
   x = 1,182.78