Finding the Fourth Proportional to 15,784.30, 21,781.64 and 8,614.03

Step by Step Solution

1. Step 1: Write the proportion equation
   15,784.30 : 21,781.64 = 8,614.03 : x
2. Step 2: Convert to fraction form
   15,784.30/21,781.64 = 8,614.03/x
3. Step 3: Cross multiply
   15,784.30x = 21,781.64 × 8,614.03
4. Step 4: Simplify right side
   15,784.30x = 187,627,736.83
5. Step 5: Solve for x
   x = 187,627,736.83/15,784.30
6. Step 6: Final answer
   x = 11,886.99