Finding the Fourth Proportional to 1,555.69, 2,146.85 and 857.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,555.69 : 2,146.85 = 857.06 : x
2. Step 2: Convert to fraction form
   1,555.69/2,146.85 = 857.06/x
3. Step 3: Cross multiply
   1,555.69x = 2,146.85 × 857.06
4. Step 4: Simplify right side
   1,555.69x = 1,839,986.77
5. Step 5: Solve for x
   x = 1,839,986.77/1,555.69
6. Step 6: Final answer
   x = 1,182.75