Finding the Fourth Proportional to 1,389.03, 1,916.92 and 799.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,389.03 : 1,916.92 = 799.56 : x
2. Step 2: Convert to fraction form
   1,389.03/1,916.92 = 799.56/x
3. Step 3: Cross multiply
   1,389.03x = 1,916.92 × 799.56
4. Step 4: Simplify right side
   1,389.03x = 1,532,688.56
5. Step 5: Solve for x
   x = 1,532,688.56/1,389.03
6. Step 6: Final answer
   x = 1,103.43