Finding the Fourth Proportional to 1,309.83, 1,807.34 and 961.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,309.83 : 1,807.34 = 961.35 : x
2. Step 2: Convert to fraction form
   1,309.83/1,807.34 = 961.35/x
3. Step 3: Cross multiply
   1,309.83x = 1,807.34 × 961.35
4. Step 4: Simplify right side
   1,309.83x = 1,737,481.50
5. Step 5: Solve for x
   x = 1,737,481.50/1,309.83
6. Step 6: Final answer
   x = 1,326.49