Finding the Fourth Proportional to 8,477.60, 12,712.56 and 5,513.12

Step by Step Solution

1. Step 1: Write the proportion equation
   8,477.60 : 12,712.56 = 5,513.12 : x
2. Step 2: Convert to fraction form
   8,477.60/12,712.56 = 5,513.12/x
3. Step 3: Cross multiply
   8,477.60x = 12,712.56 × 5,513.12
4. Step 4: Simplify right side
   8,477.60x = 70,085,868.79
5. Step 5: Solve for x
   x = 70,085,868.79/8,477.60
6. Step 6: Final answer
   x = 8,267.18