Finding the Fourth Proportional to 1,404.75, 1,938.56 and 783.75

Step by Step Solution

1. Step 1: Write the proportion equation
   1,404.75 : 1,938.56 = 783.75 : x
2. Step 2: Convert to fraction form
   1,404.75/1,938.56 = 783.75/x
3. Step 3: Cross multiply
   1,404.75x = 1,938.56 × 783.75
4. Step 4: Simplify right side
   1,404.75x = 1,519,342.48
5. Step 5: Solve for x
   x = 1,519,342.48/1,404.75
6. Step 6: Final answer
   x = 1,081.58