Finding the Fourth Proportional to 16,139.52, 22,268.61 and 9,421.32

Step by Step Solution

1. Step 1: Write the proportion equation
   16,139.52 : 22,268.61 = 9,421.32 : x
2. Step 2: Convert to fraction form
   16,139.52/22,268.61 = 9,421.32/x
3. Step 3: Cross multiply
   16,139.52x = 22,268.61 × 9,421.32
4. Step 4: Simplify right side
   16,139.52x = 209,799,700.77
5. Step 5: Solve for x
   x = 209,799,700.77/16,139.52
6. Step 6: Final answer
   x = 12,999.13