Finding the Fourth Proportional to 1,372.59, 1,894.20 and 783.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,372.59 : 1,894.20 = 783.18 : x
2. Step 2: Convert to fraction form
   1,372.59/1,894.20 = 783.18/x
3. Step 3: Cross multiply
   1,372.59x = 1,894.20 × 783.18
4. Step 4: Simplify right side
   1,372.59x = 1,483,499.56
5. Step 5: Solve for x
   x = 1,483,499.56/1,372.59
6. Step 6: Final answer
   x = 1,080.80