Finding the Fourth Proportional to 1,404.88, 1,938.72 and 783.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,404.88 : 1,938.72 = 783.88 : x
2. Step 2: Convert to fraction form
   1,404.88/1,938.72 = 783.88/x
3. Step 3: Cross multiply
   1,404.88x = 1,938.72 × 783.88
4. Step 4: Simplify right side
   1,404.88x = 1,519,723.83
5. Step 5: Solve for x
   x = 1,519,723.83/1,404.88
6. Step 6: Final answer
   x = 1,081.75