Finding the Fourth Proportional to 28,274.92, 42,405.90 and 12,697

Step by Step Solution

1. Step 1: Write the proportion equation
   28,274.92 : 42,405.90 = 12,697 : x
2. Step 2: Convert to fraction form
   28,274.92/42,405.90 = 12,697/x
3. Step 3: Cross multiply
   28,274.92x = 42,405.90 × 12,697
4. Step 4: Simplify right side
   28,274.92x = 538,427,712.30
5. Step 5: Solve for x
   x = 538,427,712.30/28,274.92
6. Step 6: Final answer
   x = 19,042.59