Finding the Fourth Proportional to 12,870.18, 19,304.34 and 8,432.39

Step by Step Solution

1. Step 1: Write the proportion equation
   12,870.18 : 19,304.34 = 8,432.39 : x
2. Step 2: Convert to fraction form
   12,870.18/19,304.34 = 8,432.39/x
3. Step 3: Cross multiply
   12,870.18x = 19,304.34 × 8,432.39
4. Step 4: Simplify right side
   12,870.18x = 162,781,627.05
5. Step 5: Solve for x
   x = 162,781,627.05/12,870.18
6. Step 6: Final answer
   x = 12,647.97