Finding the Fourth Proportional to 15,805.73, 21,792.92 and 12,784.10

Step by Step Solution

1. Step 1: Write the proportion equation
   15,805.73 : 21,792.92 = 12,784.10 : x
2. Step 2: Convert to fraction form
   15,805.73/21,792.92 = 12,784.10/x
3. Step 3: Cross multiply
   15,805.73x = 21,792.92 × 12,784.10
4. Step 4: Simplify right side
   15,805.73x = 278,602,695.69
5. Step 5: Solve for x
   x = 278,602,695.69/15,805.73
6. Step 6: Final answer
   x = 17,626.69