Finding the Fourth Proportional to 1,611.87, 2,224.37 and 903.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,611.87 : 2,224.37 = 903.72 : x
2. Step 2: Convert to fraction form
   1,611.87/2,224.37 = 903.72/x
3. Step 3: Cross multiply
   1,611.87x = 2,224.37 × 903.72
4. Step 4: Simplify right side
   1,611.87x = 2,010,196.53
5. Step 5: Solve for x
   x = 2,010,196.53/1,611.87
6. Step 6: Final answer
   x = 1,247.12