Finding the Fourth Proportional to 1,372.61, 1,894.15 and 783.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,372.61 : 1,894.15 = 783.03 : x
2. Step 2: Convert to fraction form
   1,372.61/1,894.15 = 783.03/x
3. Step 3: Cross multiply
   1,372.61x = 1,894.15 × 783.03
4. Step 4: Simplify right side
   1,372.61x = 1,483,176.27
5. Step 5: Solve for x
   x = 1,483,176.27/1,372.61
6. Step 6: Final answer
   x = 1,080.55