Finding the Fourth Proportional to 1,417.67, 2,113.56 and 1,399.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,417.67 : 2,113.56 = 1,399.40 : x
2. Step 2: Convert to fraction form
   1,417.67/2,113.56 = 1,399.40/x
3. Step 3: Cross multiply
   1,417.67x = 2,113.56 × 1,399.40
4. Step 4: Simplify right side
   1,417.67x = 2,957,715.86
5. Step 5: Solve for x
   x = 2,957,715.86/1,417.67
6. Step 6: Final answer
   x = 2,086.32