Finding the Fourth Proportional to 42,525, 63,790.20 and 12,945.02

Step by Step Solution

1. Step 1: Write the proportion equation
   42,525 : 63,790.20 = 12,945.02 : x
2. Step 2: Convert to fraction form
   42,525/63,790.20 = 12,945.02/x
3. Step 3: Cross multiply
   42,525x = 63,790.20 × 12,945.02
4. Step 4: Simplify right side
   42,525x = 825,765,095.85
5. Step 5: Solve for x
   x = 825,765,095.85/42,525
6. Step 6: Final answer
   x = 19,418.34