Finding the Fourth Proportional to 42,015.42, 63,004.65 and 12,435.54

Step by Step Solution

1. Step 1: Write the proportion equation
   42,015.42 : 63,004.65 = 12,435.54 : x
2. Step 2: Convert to fraction form
   42,015.42/63,004.65 = 12,435.54/x
3. Step 3: Cross multiply
   42,015.42x = 63,004.65 × 12,435.54
4. Step 4: Simplify right side
   42,015.42x = 783,496,845.26
5. Step 5: Solve for x
   x = 783,496,845.26/42,015.42
6. Step 6: Final answer
   x = 18,647.84