Finding the Fourth Proportional to 1,395.90, 1,926.46 and 898.23

Step by Step Solution

1. Step 1: Write the proportion equation
   1,395.90 : 1,926.46 = 898.23 : x
2. Step 2: Convert to fraction form
   1,395.90/1,926.46 = 898.23/x
3. Step 3: Cross multiply
   1,395.90x = 1,926.46 × 898.23
4. Step 4: Simplify right side
   1,395.90x = 1,730,404.17
5. Step 5: Solve for x
   x = 1,730,404.17/1,395.90
6. Step 6: Final answer
   x = 1,239.63