Finding the Fourth Proportional to 12,810.85, 17,658.76 and 9,619.54

Step by Step Solution

1. Step 1: Write the proportion equation
   12,810.85 : 17,658.76 = 9,619.54 : x
2. Step 2: Convert to fraction form
   12,810.85/17,658.76 = 9,619.54/x
3. Step 3: Cross multiply
   12,810.85x = 17,658.76 × 9,619.54
4. Step 4: Simplify right side
   12,810.85x = 169,869,148.17
5. Step 5: Solve for x
   x = 169,869,148.17/12,810.85
6. Step 6: Final answer
   x = 13,259.79