Finding the Fourth Proportional to 1,396.45, 1,926.18 and 898.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,396.45 : 1,926.18 = 898.30 : x
2. Step 2: Convert to fraction form
   1,396.45/1,926.18 = 898.30/x
3. Step 3: Cross multiply
   1,396.45x = 1,926.18 × 898.30
4. Step 4: Simplify right side
   1,396.45x = 1,730,287.49
5. Step 5: Solve for x
   x = 1,730,287.49/1,396.45
6. Step 6: Final answer
   x = 1,239.06