Finding the Fourth Proportional to 1,389.02, 1,916.80 and 799.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,389.02 : 1,916.80 = 799.54 : x
2. Step 2: Convert to fraction form
   1,389.02/1,916.80 = 799.54/x
3. Step 3: Cross multiply
   1,389.02x = 1,916.80 × 799.54
4. Step 4: Simplify right side
   1,389.02x = 1,532,551.48
5. Step 5: Solve for x
   x = 1,532,551.48/1,389.02
6. Step 6: Final answer
   x = 1,103.34