Finding the Fourth Proportional to 8,785.86, 12,128.45 and 5,603.43

Step by Step Solution

1. Step 1: Write the proportion equation
   8,785.86 : 12,128.45 = 5,603.43 : x
2. Step 2: Convert to fraction form
   8,785.86/12,128.45 = 5,603.43/x
3. Step 3: Cross multiply
   8,785.86x = 12,128.45 × 5,603.43
4. Step 4: Simplify right side
   8,785.86x = 67,960,920.58
5. Step 5: Solve for x
   x = 67,960,920.58/8,785.86
6. Step 6: Final answer
   x = 7,735.26