Finding the Fourth Proportional to 1,369.25, 2,054.38 and 783.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,369.25 : 2,054.38 = 783.89 : x
2. Step 2: Convert to fraction form
   1,369.25/2,054.38 = 783.89/x
3. Step 3: Cross multiply
   1,369.25x = 2,054.38 × 783.89
4. Step 4: Simplify right side
   1,369.25x = 1,610,407.94
5. Step 5: Solve for x
   x = 1,610,407.94/1,369.25
6. Step 6: Final answer
   x = 1,176.12