Finding the Fourth Proportional to 1,396.89, 1,917.60 and 1,200.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,396.89 : 1,917.60 = 1,200.06 : x
2. Step 2: Convert to fraction form
   1,396.89/1,917.60 = 1,200.06/x
3. Step 3: Cross multiply
   1,396.89x = 1,917.60 × 1,200.06
4. Step 4: Simplify right side
   1,396.89x = 2,301,235.06
5. Step 5: Solve for x
   x = 2,301,235.06/1,396.89
6. Step 6: Final answer
   x = 1,647.40