Finding the Fourth Proportional to 1,404.81, 1,938.74 and 783.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,404.81 : 1,938.74 = 783.81 : x
2. Step 2: Convert to fraction form
   1,404.81/1,938.74 = 783.81/x
3. Step 3: Cross multiply
   1,404.81x = 1,938.74 × 783.81
4. Step 4: Simplify right side
   1,404.81x = 1,519,599.88
5. Step 5: Solve for x
   x = 1,519,599.88/1,404.81
6. Step 6: Final answer
   x = 1,081.71