Finding the Fourth Proportional to 42,412.10, 63,601.95 and 12,820.10

Step by Step Solution

1. Step 1: Write the proportion equation
   42,412.10 : 63,601.95 = 12,820.10 : x
2. Step 2: Convert to fraction form
   42,412.10/63,601.95 = 12,820.10/x
3. Step 3: Cross multiply
   42,412.10x = 63,601.95 × 12,820.10
4. Step 4: Simplify right side
   42,412.10x = 815,383,359.20
5. Step 5: Solve for x
   x = 815,383,359.20/42,412.10
6. Step 6: Final answer
   x = 19,225.25