Finding the Fourth Proportional to 42,414.32, 63,606.54 and 12,420.29

Step by Step Solution

1. Step 1: Write the proportion equation
   42,414.32 : 63,606.54 = 12,420.29 : x
2. Step 2: Convert to fraction form
   42,414.32/63,606.54 = 12,420.29/x
3. Step 3: Cross multiply
   42,414.32x = 63,606.54 × 12,420.29
4. Step 4: Simplify right side
   42,414.32x = 790,011,672.70
5. Step 5: Solve for x
   x = 790,011,672.70/42,414.32
6. Step 6: Final answer
   x = 18,626.06