Finding the Fourth Proportional to 1,404.24, 1,937.40 and 783.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,404.24 : 1,937.40 = 783.12 : x
2. Step 2: Convert to fraction form
   1,404.24/1,937.40 = 783.12/x
3. Step 3: Cross multiply
   1,404.24x = 1,937.40 × 783.12
4. Step 4: Simplify right side
   1,404.24x = 1,517,216.69
5. Step 5: Solve for x
   x = 1,517,216.69/1,404.24
6. Step 6: Final answer
   x = 1,080.45