Finding the Fourth Proportional to 1,405.22, 2,105.13 and 787.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,405.22 : 2,105.13 = 787.05 : x
2. Step 2: Convert to fraction form
   1,405.22/2,105.13 = 787.05/x
3. Step 3: Cross multiply
   1,405.22x = 2,105.13 × 787.05
4. Step 4: Simplify right side
   1,405.22x = 1,656,842.57
5. Step 5: Solve for x
   x = 1,656,842.57/1,405.22
6. Step 6: Final answer
   x = 1,179.06