Finding the Fourth Proportional to 8,785.65, 12,128.15 and 5,603.22

Step by Step Solution

1. Step 1: Write the proportion equation
   8,785.65 : 12,128.15 = 5,603.22 : x
2. Step 2: Convert to fraction form
   8,785.65/12,128.15 = 5,603.22/x
3. Step 3: Cross multiply
   8,785.65x = 12,128.15 × 5,603.22
4. Step 4: Simplify right side
   8,785.65x = 67,956,692.64
5. Step 5: Solve for x
   x = 67,956,692.64/8,785.65
6. Step 6: Final answer
   x = 7,734.96