Finding the Fourth Proportional to 1,405.03, 2,105.05 and 1,321.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,405.03 : 2,105.05 = 1,321.69 : x
2. Step 2: Convert to fraction form
   1,405.03/2,105.05 = 1,321.69/x
3. Step 3: Cross multiply
   1,405.03x = 2,105.05 × 1,321.69
4. Step 4: Simplify right side
   1,405.03x = 2,782,223.53
5. Step 5: Solve for x
   x = 2,782,223.53/1,405.03
6. Step 6: Final answer
   x = 1,980.19