Finding the Fourth Proportional to 1,405.73, 2,105.32 and 1,111.26

Step by Step Solution

1. Step 1: Write the proportion equation
   1,405.73 : 2,105.32 = 1,111.26 : x
2. Step 2: Convert to fraction form
   1,405.73/2,105.32 = 1,111.26/x
3. Step 3: Cross multiply
   1,405.73x = 2,105.32 × 1,111.26
4. Step 4: Simplify right side
   1,405.73x = 2,339,547.18
5. Step 5: Solve for x
   x = 2,339,547.18/1,405.73
6. Step 6: Final answer
   x = 1,664.29