Finding the Fourth Proportional to 1,513.89, 2,269.69 and 783

Step by Step Solution

1. Step 1: Write the proportion equation
   1,513.89 : 2,269.69 = 783 : x
2. Step 2: Convert to fraction form
   1,513.89/2,269.69 = 783/x
3. Step 3: Cross multiply
   1,513.89x = 2,269.69 × 783
4. Step 4: Simplify right side
   1,513.89x = 1,777,167.27
5. Step 5: Solve for x
   x = 1,777,167.27/1,513.89
6. Step 6: Final answer
   x = 1,173.91