Finding the Fourth Proportional to 1,305.90, 1,804.10 and 858.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,305.90 : 1,804.10 = 858.83 : x
2. Step 2: Convert to fraction form
   1,305.90/1,804.10 = 858.83/x
3. Step 3: Cross multiply
   1,305.90x = 1,804.10 × 858.83
4. Step 4: Simplify right side
   1,305.90x = 1,549,401.89
5. Step 5: Solve for x
   x = 1,549,401.89/1,305.90
6. Step 6: Final answer
   x = 1,186.46