Finding the Fourth Proportional to 9,359.61, 12,911.59 and 5,580.11

Step by Step Solution

1. Step 1: Write the proportion equation
   9,359.61 : 12,911.59 = 5,580.11 : x
2. Step 2: Convert to fraction form
   9,359.61/12,911.59 = 5,580.11/x
3. Step 3: Cross multiply
   9,359.61x = 12,911.59 × 5,580.11
4. Step 4: Simplify right side
   9,359.61x = 72,048,027.92
5. Step 5: Solve for x
   x = 72,048,027.92/9,359.61
6. Step 6: Final answer
   x = 7,697.76