Finding the Fourth Proportional to 15,799.82, 21,810.72 and 9,428.62

Step by Step Solution

1. Step 1: Write the proportion equation
   15,799.82 : 21,810.72 = 9,428.62 : x
2. Step 2: Convert to fraction form
   15,799.82/21,810.72 = 9,428.62/x
3. Step 3: Cross multiply
   15,799.82x = 21,810.72 × 9,428.62
4. Step 4: Simplify right side
   15,799.82x = 205,644,990.81
5. Step 5: Solve for x
   x = 205,644,990.81/15,799.82
6. Step 6: Final answer
   x = 13,015.65