Finding the Fourth Proportional to 12,300.80, 18,462.72 and 6,461.60

Step by Step Solution

1. Step 1: Write the proportion equation
   12,300.80 : 18,462.72 = 6,461.60 : x
2. Step 2: Convert to fraction form
   12,300.80/18,462.72 = 6,461.60/x
3. Step 3: Cross multiply
   12,300.80x = 18,462.72 × 6,461.60
4. Step 4: Simplify right side
   12,300.80x = 119,298,711.55
5. Step 5: Solve for x
   x = 119,298,711.55/12,300.80
6. Step 6: Final answer
   x = 9,698.45