Finding the Fourth Proportional to 42,079.20, 63,113.94 and 12,493.96

Step by Step Solution

1. Step 1: Write the proportion equation
   42,079.20 : 63,113.94 = 12,493.96 : x
2. Step 2: Convert to fraction form
   42,079.20/63,113.94 = 12,493.96/x
3. Step 3: Cross multiply
   42,079.20x = 63,113.94 × 12,493.96
4. Step 4: Simplify right side
   42,079.20x = 788,543,041.80
5. Step 5: Solve for x
   x = 788,543,041.80/42,079.20
6. Step 6: Final answer
   x = 18,739.50