Finding the Fourth Proportional to 42,009.16, 63,013.53 and 12,427.15

Step by Step Solution

1. Step 1: Write the proportion equation
   42,009.16 : 63,013.53 = 12,427.15 : x
2. Step 2: Convert to fraction form
   42,009.16/63,013.53 = 12,427.15/x
3. Step 3: Cross multiply
   42,009.16x = 63,013.53 × 12,427.15
4. Step 4: Simplify right side
   42,009.16x = 783,078,589.34
5. Step 5: Solve for x
   x = 783,078,589.34/42,009.16
6. Step 6: Final answer
   x = 18,640.66