Finding the Fourth Proportional to 1,603.51, 2,212.86 and 904.75

Step by Step Solution

1. Step 1: Write the proportion equation
   1,603.51 : 2,212.86 = 904.75 : x
2. Step 2: Convert to fraction form
   1,603.51/2,212.86 = 904.75/x
3. Step 3: Cross multiply
   1,603.51x = 2,212.86 × 904.75
4. Step 4: Simplify right side
   1,603.51x = 2,002,085.09
5. Step 5: Solve for x
   x = 2,002,085.09/1,603.51
6. Step 6: Final answer
   x = 1,248.56