Finding the Fourth Proportional to 12,120.50, 16,726.30 and 7,404.75

Step by Step Solution

1. Step 1: Write the proportion equation
   12,120.50 : 16,726.30 = 7,404.75 : x
2. Step 2: Convert to fraction form
   12,120.50/16,726.30 = 7,404.75/x
3. Step 3: Cross multiply
   12,120.50x = 16,726.30 × 7,404.75
4. Step 4: Simplify right side
   12,120.50x = 123,854,051.41
5. Step 5: Solve for x
   x = 123,854,051.41/12,120.50
6. Step 6: Final answer
   x = 10,218.56