Finding the Fourth Proportional to 1,362.77, 1,880.40 and 858.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,362.77 : 1,880.40 = 858.55 : x
2. Step 2: Convert to fraction form
   1,362.77/1,880.40 = 858.55/x
3. Step 3: Cross multiply
   1,362.77x = 1,880.40 × 858.55
4. Step 4: Simplify right side
   1,362.77x = 1,614,417.42
5. Step 5: Solve for x
   x = 1,614,417.42/1,362.77
6. Step 6: Final answer
   x = 1,184.66