Finding the Fourth Proportional to 16,003.57, 22,088.87 and 9,721.21

Step by Step Solution

1. Step 1: Write the proportion equation
   16,003.57 : 22,088.87 = 9,721.21 : x
2. Step 2: Convert to fraction form
   16,003.57/22,088.87 = 9,721.21/x
3. Step 3: Cross multiply
   16,003.57x = 22,088.87 × 9,721.21
4. Step 4: Simplify right side
   16,003.57x = 214,730,543.93
5. Step 5: Solve for x
   x = 214,730,543.93/16,003.57
6. Step 6: Final answer
   x = 13,417.67