Finding the Fourth Proportional to 12,720.50, 17,559.06 and 7,416.98

Step by Step Solution

1. Step 1: Write the proportion equation
   12,720.50 : 17,559.06 = 7,416.98 : x
2. Step 2: Convert to fraction form
   12,720.50/17,559.06 = 7,416.98/x
3. Step 3: Cross multiply
   12,720.50x = 17,559.06 × 7,416.98
4. Step 4: Simplify right side
   12,720.50x = 130,235,196.84
5. Step 5: Solve for x
   x = 130,235,196.84/12,720.50
6. Step 6: Final answer
   x = 10,238.21