Finding the Fourth Proportional to 16,419.36, 22,659.86 and 9,345.78

Step by Step Solution

1. Step 1: Write the proportion equation
   16,419.36 : 22,659.86 = 9,345.78 : x
2. Step 2: Convert to fraction form
   16,419.36/22,659.86 = 9,345.78/x
3. Step 3: Cross multiply
   16,419.36x = 22,659.86 × 9,345.78
4. Step 4: Simplify right side
   16,419.36x = 211,774,089.76
5. Step 5: Solve for x
   x = 211,774,089.76/16,419.36
6. Step 6: Final answer
   x = 12,897.83