Finding the Fourth Proportional to 15,300.56, 21,109.96 and 8,585.20

Step by Step Solution

1. Step 1: Write the proportion equation
   15,300.56 : 21,109.96 = 8,585.20 : x
2. Step 2: Convert to fraction form
   15,300.56/21,109.96 = 8,585.20/x
3. Step 3: Cross multiply
   15,300.56x = 21,109.96 × 8,585.20
4. Step 4: Simplify right side
   15,300.56x = 181,233,228.59
5. Step 5: Solve for x
   x = 181,233,228.59/15,300.56
6. Step 6: Final answer
   x = 11,844.88