Finding the Fourth Proportional to 20,924.82, 28,898.91 and 12,985.98

Step by Step Solution

1. Step 1: Write the proportion equation
   20,924.82 : 28,898.91 = 12,985.98 : x
2. Step 2: Convert to fraction form
   20,924.82/28,898.91 = 12,985.98/x
3. Step 3: Cross multiply
   20,924.82x = 28,898.91 × 12,985.98
4. Step 4: Simplify right side
   20,924.82x = 375,280,667.28
5. Step 5: Solve for x
   x = 375,280,667.28/20,924.82
6. Step 6: Final answer
   x = 17,934.71