Finding the Fourth Proportional to 42,146.20, 63,222.56 and 12,561.76

Step by Step Solution

1. Step 1: Write the proportion equation
   42,146.20 : 63,222.56 = 12,561.76 : x
2. Step 2: Convert to fraction form
   42,146.20/63,222.56 = 12,561.76/x
3. Step 3: Cross multiply
   42,146.20x = 63,222.56 × 12,561.76
4. Step 4: Simplify right side
   42,146.20x = 794,186,625.31
5. Step 5: Solve for x
   x = 794,186,625.31/42,146.20
6. Step 6: Final answer
   x = 18,843.61