Finding the Fourth Proportional to 28,020.06, 38,667.98 and 16,689.72

Step by Step Solution

1. Step 1: Write the proportion equation
   28,020.06 : 38,667.98 = 16,689.72 : x
2. Step 2: Convert to fraction form
   28,020.06/38,667.98 = 16,689.72/x
3. Step 3: Cross multiply
   28,020.06x = 38,667.98 × 16,689.72
4. Step 4: Simplify right side
   28,020.06x = 645,357,759.17
5. Step 5: Solve for x
   x = 645,357,759.17/28,020.06
6. Step 6: Final answer
   x = 23,031.99