Finding the Fourth Proportional to 12,974.10, 19,432.35 and 12,686.10

Step by Step Solution

1. Step 1: Write the proportion equation
   12,974.10 : 19,432.35 = 12,686.10 : x
2. Step 2: Convert to fraction form
   12,974.10/19,432.35 = 12,686.10/x
3. Step 3: Cross multiply
   12,974.10x = 19,432.35 × 12,686.10
4. Step 4: Simplify right side
   12,974.10x = 246,520,735.34
5. Step 5: Solve for x
   x = 246,520,735.34/12,974.10
6. Step 6: Final answer
   x = 19,000.99