Finding the Fourth Proportional to 8,785.94, 12,128.54 and 5,603.51

Step by Step Solution

1. Step 1: Write the proportion equation
   8,785.94 : 12,128.54 = 5,603.51 : x
2. Step 2: Convert to fraction form
   8,785.94/12,128.54 = 5,603.51/x
3. Step 3: Cross multiply
   8,785.94x = 12,128.54 × 5,603.51
4. Step 4: Simplify right side
   8,785.94x = 67,962,397.48
5. Step 5: Solve for x
   x = 67,962,397.48/8,785.94
6. Step 6: Final answer
   x = 7,735.36