Finding the Fourth Proportional to 8,403.88, 12,603.58 and 5,105.56

Step by Step Solution

1. Step 1: Write the proportion equation
   8,403.88 : 12,603.58 = 5,105.56 : x
2. Step 2: Convert to fraction form
   8,403.88/12,603.58 = 5,105.56/x
3. Step 3: Cross multiply
   8,403.88x = 12,603.58 × 5,105.56
4. Step 4: Simplify right side
   8,403.88x = 64,348,333.90
5. Step 5: Solve for x
   x = 64,348,333.90/8,403.88
6. Step 6: Final answer
   x = 7,656.98