Finding the Fourth Proportional to 28,404.92, 42,612.78 and 12,822.50

Step by Step Solution

1. Step 1: Write the proportion equation
   28,404.92 : 42,612.78 = 12,822.50 : x
2. Step 2: Convert to fraction form
   28,404.92/42,612.78 = 12,822.50/x
3. Step 3: Cross multiply
   28,404.92x = 42,612.78 × 12,822.50
4. Step 4: Simplify right side
   28,404.92x = 546,402,371.55
5. Step 5: Solve for x
   x = 546,402,371.55/28,404.92
6. Step 6: Final answer
   x = 19,236.19