Finding the Fourth Proportional to 23,061.62, 31,819.43 and 12,990.05

Step by Step Solution

1. Step 1: Write the proportion equation
   23,061.62 : 31,819.43 = 12,990.05 : x
2. Step 2: Convert to fraction form
   23,061.62/31,819.43 = 12,990.05/x
3. Step 3: Cross multiply
   23,061.62x = 31,819.43 × 12,990.05
4. Step 4: Simplify right side
   23,061.62x = 413,336,098.70
5. Step 5: Solve for x
   x = 413,336,098.70/23,061.62
6. Step 6: Final answer
   x = 17,923.12