Finding the Fourth Proportional to 1,399.72, 1,932.12 and 934

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.72 : 1,932.12 = 934 : x
2. Step 2: Convert to fraction form
   1,399.72/1,932.12 = 934/x
3. Step 3: Cross multiply
   1,399.72x = 1,932.12 × 934
4. Step 4: Simplify right side
   1,399.72x = 1,804,600.08
5. Step 5: Solve for x
   x = 1,804,600.08/1,399.72
6. Step 6: Final answer
   x = 1,289.26