Finding the Fourth Proportional to 20,490.38, 30,701.59 and 12,460.86

Step by Step Solution

1. Step 1: Write the proportion equation
   20,490.38 : 30,701.59 = 12,460.86 : x
2. Step 2: Convert to fraction form
   20,490.38/30,701.59 = 12,460.86/x
3. Step 3: Cross multiply
   20,490.38x = 30,701.59 × 12,460.86
4. Step 4: Simplify right side
   20,490.38x = 382,568,292.82
5. Step 5: Solve for x
   x = 382,568,292.82/20,490.38
6. Step 6: Final answer
   x = 18,670.63