Finding the Fourth Proportional to 9,099.48, 12,557.10 and 5,120.56

Step by Step Solution

1. Step 1: Write the proportion equation
   9,099.48 : 12,557.10 = 5,120.56 : x
2. Step 2: Convert to fraction form
   9,099.48/12,557.10 = 5,120.56/x
3. Step 3: Cross multiply
   9,099.48x = 12,557.10 × 5,120.56
4. Step 4: Simplify right side
   9,099.48x = 64,299,383.98
5. Step 5: Solve for x
   x = 64,299,383.98/9,099.48
6. Step 6: Final answer
   x = 7,066.27