Finding the Fourth Proportional to 1,340.07, 1,856.78 and 1,309.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,340.07 : 1,856.78 = 1,309.83 : x
2. Step 2: Convert to fraction form
   1,340.07/1,856.78 = 1,309.83/x
3. Step 3: Cross multiply
   1,340.07x = 1,856.78 × 1,309.83
4. Step 4: Simplify right side
   1,340.07x = 2,432,059.60
5. Step 5: Solve for x
   x = 2,432,059.60/1,340.07
6. Step 6: Final answer
   x = 1,814.88