Finding the Fourth Proportional to 12,117.12, 16,721.52 and 7,400.64

Step by Step Solution

1. Step 1: Write the proportion equation
   12,117.12 : 16,721.52 = 7,400.64 : x
2. Step 2: Convert to fraction form
   12,117.12/16,721.52 = 7,400.64/x
3. Step 3: Cross multiply
   12,117.12x = 16,721.52 × 7,400.64
4. Step 4: Simplify right side
   12,117.12x = 123,749,949.77
5. Step 5: Solve for x
   x = 123,749,949.77/12,117.12
6. Step 6: Final answer
   x = 10,212.82