Finding the Fourth Proportional to 1,355.04, 1,870.60 and 858.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,355.04 : 1,870.60 = 858.16 : x
2. Step 2: Convert to fraction form
   1,355.04/1,870.60 = 858.16/x
3. Step 3: Cross multiply
   1,355.04x = 1,870.60 × 858.16
4. Step 4: Simplify right side
   1,355.04x = 1,605,274.10
5. Step 5: Solve for x
   x = 1,605,274.10/1,355.04
6. Step 6: Final answer
   x = 1,184.67