Finding the Fourth Proportional to 1,372.55, 1,894.09 and 783.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,372.55 : 1,894.09 = 783.09 : x
2. Step 2: Convert to fraction form
   1,372.55/1,894.09 = 783.09/x
3. Step 3: Cross multiply
   1,372.55x = 1,894.09 × 783.09
4. Step 4: Simplify right side
   1,372.55x = 1,483,242.94
5. Step 5: Solve for x
   x = 1,483,242.94/1,372.55
6. Step 6: Final answer
   x = 1,080.65