Finding the Fourth Proportional to 1,603.78, 2,212.56 and 1,079.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,603.78 : 2,212.56 = 1,079.98 : x
2. Step 2: Convert to fraction form
   1,603.78/2,212.56 = 1,079.98/x
3. Step 3: Cross multiply
   1,603.78x = 2,212.56 × 1,079.98
4. Step 4: Simplify right side
   1,603.78x = 2,389,520.55
5. Step 5: Solve for x
   x = 2,389,520.55/1,603.78
6. Step 6: Final answer
   x = 1,489.93