Finding the Fourth Proportional to 9,144.21, 12,618.90 and 5,557.98

Step by Step Solution

1. Step 1: Write the proportion equation
   9,144.21 : 12,618.90 = 5,557.98 : x
2. Step 2: Convert to fraction form
   9,144.21/12,618.90 = 5,557.98/x
3. Step 3: Cross multiply
   9,144.21x = 12,618.90 × 5,557.98
4. Step 4: Simplify right side
   9,144.21x = 70,135,593.82
5. Step 5: Solve for x
   x = 70,135,593.82/9,144.21
6. Step 6: Final answer
   x = 7,669.95