Finding the Fourth Proportional to 1,355.37, 1,870.03 and 858.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,355.37 : 1,870.03 = 858.22 : x
2. Step 2: Convert to fraction form
   1,355.37/1,870.03 = 858.22/x
3. Step 3: Cross multiply
   1,355.37x = 1,870.03 × 858.22
4. Step 4: Simplify right side
   1,355.37x = 1,604,897.15
5. Step 5: Solve for x
   x = 1,604,897.15/1,355.37
6. Step 6: Final answer
   x = 1,184.10