Finding the Fourth Proportional to 15,784.16, 21,782.28 and 8,710.52

Step by Step Solution

1. Step 1: Write the proportion equation
   15,784.16 : 21,782.28 = 8,710.52 : x
2. Step 2: Convert to fraction form
   15,784.16/21,782.28 = 8,710.52/x
3. Step 3: Cross multiply
   15,784.16x = 21,782.28 × 8,710.52
4. Step 4: Simplify right side
   15,784.16x = 189,734,985.59
5. Step 5: Solve for x
   x = 189,734,985.59/15,784.16
6. Step 6: Final answer
   x = 12,020.59