Finding the Fourth Proportional to 1,603.61, 2,213.27 and 931.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,603.61 : 2,213.27 = 931.82 : x
2. Step 2: Convert to fraction form
   1,603.61/2,213.27 = 931.82/x
3. Step 3: Cross multiply
   1,603.61x = 2,213.27 × 931.82
4. Step 4: Simplify right side
   1,603.61x = 2,062,353.53
5. Step 5: Solve for x
   x = 2,062,353.53/1,603.61
6. Step 6: Final answer
   x = 1,286.07