Finding the Fourth Proportional to 21,036.71, 31,567.13 and 8,554.43

Step by Step Solution

1. Step 1: Write the proportion equation
   21,036.71 : 31,567.13 = 8,554.43 : x
2. Step 2: Convert to fraction form
   21,036.71/31,567.13 = 8,554.43/x
3. Step 3: Cross multiply
   21,036.71x = 31,567.13 × 8,554.43
4. Step 4: Simplify right side
   21,036.71x = 270,038,803.89
5. Step 5: Solve for x
   x = 270,038,803.89/21,036.71
6. Step 6: Final answer
   x = 12,836.55