Finding the Fourth Proportional to 12,200.59, 16,830.32 and 7,421.99

Step by Step Solution

1. Step 1: Write the proportion equation
   12,200.59 : 16,830.32 = 7,421.99 : x
2. Step 2: Convert to fraction form
   12,200.59/16,830.32 = 7,421.99/x
3. Step 3: Cross multiply
   12,200.59x = 16,830.32 × 7,421.99
4. Step 4: Simplify right side
   12,200.59x = 124,914,499.54
5. Step 5: Solve for x
   x = 124,914,499.54/12,200.59
6. Step 6: Final answer
   x = 10,238.40