Finding the Fourth Proportional to 15,643.70, 21,588.69 and 8,570.14

Step by Step Solution

1. Step 1: Write the proportion equation
   15,643.70 : 21,588.69 = 8,570.14 : x
2. Step 2: Convert to fraction form
   15,643.70/21,588.69 = 8,570.14/x
3. Step 3: Cross multiply
   15,643.70x = 21,588.69 × 8,570.14
4. Step 4: Simplify right side
   15,643.70x = 185,018,095.72
5. Step 5: Solve for x
   x = 185,018,095.72/15,643.70
6. Step 6: Final answer
   x = 11,827.00