Finding the Fourth Proportional to 1,607.08, 2,217.83 and 898.90

Step by Step Solution

1. Step 1: Write the proportion equation
   1,607.08 : 2,217.83 = 898.90 : x
2. Step 2: Convert to fraction form
   1,607.08/2,217.83 = 898.90/x
3. Step 3: Cross multiply
   1,607.08x = 2,217.83 × 898.90
4. Step 4: Simplify right side
   1,607.08x = 1,993,609.82
5. Step 5: Solve for x
   x = 1,993,609.82/1,607.08
6. Step 6: Final answer
   x = 1,240.52