Finding the Fourth Proportional to 42,404.80, 63,582.90 and 12,818.20

Step by Step Solution

1. Step 1: Write the proportion equation
   42,404.80 : 63,582.90 = 12,818.20 : x
2. Step 2: Convert to fraction form
   42,404.80/63,582.90 = 12,818.20/x
3. Step 3: Cross multiply
   42,404.80x = 63,582.90 × 12,818.20
4. Step 4: Simplify right side
   42,404.80x = 815,018,328.78
5. Step 5: Solve for x
   x = 815,018,328.78/42,404.80
6. Step 6: Final answer
   x = 19,219.95