Finding the Fourth Proportional to 1,611.35, 2,223.83 and 903.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,611.35 : 2,223.83 = 903.30 : x
2. Step 2: Convert to fraction form
   1,611.35/2,223.83 = 903.30/x
3. Step 3: Cross multiply
   1,611.35x = 2,223.83 × 903.30
4. Step 4: Simplify right side
   1,611.35x = 2,008,785.64
5. Step 5: Solve for x
   x = 2,008,785.64/1,611.35
6. Step 6: Final answer
   x = 1,246.65