Finding the Fourth Proportional to 1,405.65, 2,099.34 and 1,321.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,405.65 : 2,099.34 = 1,321.82 : x
2. Step 2: Convert to fraction form
   1,405.65/2,099.34 = 1,321.82/x
3. Step 3: Cross multiply
   1,405.65x = 2,099.34 × 1,321.82
4. Step 4: Simplify right side
   1,405.65x = 2,774,939.10
5. Step 5: Solve for x
   x = 2,774,939.10/1,405.65
6. Step 6: Final answer
   x = 1,974.13