Finding the Fourth Proportional to 42,018.48, 63,040.08 and 12,437.10

Step by Step Solution

1. Step 1: Write the proportion equation
   42,018.48 : 63,040.08 = 12,437.10 : x
2. Step 2: Convert to fraction form
   42,018.48/63,040.08 = 12,437.10/x
3. Step 3: Cross multiply
   42,018.48x = 63,040.08 × 12,437.10
4. Step 4: Simplify right side
   42,018.48x = 784,035,778.97
5. Step 5: Solve for x
   x = 784,035,778.97/42,018.48
6. Step 6: Final answer
   x = 18,659.31