Finding the Fourth Proportional to 22,456.05, 30,991.42 and 12,897.19

Step by Step Solution

1. Step 1: Write the proportion equation
   22,456.05 : 30,991.42 = 12,897.19 : x
2. Step 2: Convert to fraction form
   22,456.05/30,991.42 = 12,897.19/x
3. Step 3: Cross multiply
   22,456.05x = 30,991.42 × 12,897.19
4. Step 4: Simplify right side
   22,456.05x = 399,702,232.11
5. Step 5: Solve for x
   x = 399,702,232.11/22,456.05
6. Step 6: Final answer
   x = 17,799.31