Finding the Fourth Proportional to 1,563.89, 2,157.81 and 934.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,563.89 : 2,157.81 = 934.30 : x
2. Step 2: Convert to fraction form
   1,563.89/2,157.81 = 934.30/x
3. Step 3: Cross multiply
   1,563.89x = 2,157.81 × 934.30
4. Step 4: Simplify right side
   1,563.89x = 2,016,041.88
5. Step 5: Solve for x
   x = 2,016,041.88/1,563.89
6. Step 6: Final answer
   x = 1,289.12