Finding the Fourth Proportional to 12,977.56, 19,462.72 and 5,580.40

Step by Step Solution

1. Step 1: Write the proportion equation
   12,977.56 : 19,462.72 = 5,580.40 : x
2. Step 2: Convert to fraction form
   12,977.56/19,462.72 = 5,580.40/x
3. Step 3: Cross multiply
   12,977.56x = 19,462.72 × 5,580.40
4. Step 4: Simplify right side
   12,977.56x = 108,609,762.69
5. Step 5: Solve for x
   x = 108,609,762.69/12,977.56
6. Step 6: Final answer
   x = 8,369.04