Finding the Fourth Proportional to 1,245.78, 1,719.50 and 803.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,245.78 : 1,719.50 = 803.52 : x
2. Step 2: Convert to fraction form
   1,245.78/1,719.50 = 803.52/x
3. Step 3: Cross multiply
   1,245.78x = 1,719.50 × 803.52
4. Step 4: Simplify right side
   1,245.78x = 1,381,648.62
5. Step 5: Solve for x
   x = 1,381,648.62/1,245.78
6. Step 6: Final answer
   x = 1,109.06