Finding the Fourth Proportional to 22,520, 31,078.56 and 12,584

Step by Step Solution

1. Step 1: Write the proportion equation
   22,520 : 31,078.56 = 12,584 : x
2. Step 2: Convert to fraction form
   22,520/31,078.56 = 12,584/x
3. Step 3: Cross multiply
   22,520x = 31,078.56 × 12,584
4. Step 4: Simplify right side
   22,520x = 391,092,599.04
5. Step 5: Solve for x
   x = 391,092,599.04/22,520
6. Step 6: Final answer
   x = 17,366.46