Finding the Fourth Proportional to 42,009.75, 62,992.35 and 12,423.49

Step by Step Solution

1. Step 1: Write the proportion equation
   42,009.75 : 62,992.35 = 12,423.49 : x
2. Step 2: Convert to fraction form
   42,009.75/62,992.35 = 12,423.49/x
3. Step 3: Cross multiply
   42,009.75x = 62,992.35 × 12,423.49
4. Step 4: Simplify right side
   42,009.75x = 782,584,672.82
5. Step 5: Solve for x
   x = 782,584,672.82/42,009.75
6. Step 6: Final answer
   x = 18,628.64