Finding the Fourth Proportional to 1,245.83, 1,718.89 and 803.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,245.83 : 1,718.89 = 803.99 : x
2. Step 2: Convert to fraction form
   1,245.83/1,718.89 = 803.99/x
3. Step 3: Cross multiply
   1,245.83x = 1,718.89 × 803.99
4. Step 4: Simplify right side
   1,245.83x = 1,381,962.78
5. Step 5: Solve for x
   x = 1,381,962.78/1,245.83
6. Step 6: Final answer
   x = 1,109.27