Finding the Fourth Proportional to 1,387.89, 2,082.20 and 694.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,387.89 : 2,082.20 = 694.53 : x
2. Step 2: Convert to fraction form
   1,387.89/2,082.20 = 694.53/x
3. Step 3: Cross multiply
   1,387.89x = 2,082.20 × 694.53
4. Step 4: Simplify right side
   1,387.89x = 1,446,146.89
5. Step 5: Solve for x
   x = 1,446,146.89/1,387.89
6. Step 6: Final answer
   x = 1,041.98