Finding the Fourth Proportional to 1,412.80, 1,949.56 and 783.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,412.80 : 1,949.56 = 783.24 : x
2. Step 2: Convert to fraction form
   1,412.80/1,949.56 = 783.24/x
3. Step 3: Cross multiply
   1,412.80x = 1,949.56 × 783.24
4. Step 4: Simplify right side
   1,412.80x = 1,526,973.37
5. Step 5: Solve for x
   x = 1,526,973.37/1,412.80
6. Step 6: Final answer
   x = 1,080.81