Finding the Fourth Proportional to 42,091.04, 63,139.98 and 12,508.90

Step by Step Solution

1. Step 1: Write the proportion equation
   42,091.04 : 63,139.98 = 12,508.90 : x
2. Step 2: Convert to fraction form
   42,091.04/63,139.98 = 12,508.90/x
3. Step 3: Cross multiply
   42,091.04x = 63,139.98 × 12,508.90
4. Step 4: Simplify right side
   42,091.04x = 789,811,695.82
5. Step 5: Solve for x
   x = 789,811,695.82/42,091.04
6. Step 6: Final answer
   x = 18,764.37