Finding the Fourth Proportional to 42,069.96, 63,104.92 and 12,487.77

Step by Step Solution

1. Step 1: Write the proportion equation
   42,069.96 : 63,104.92 = 12,487.77 : x
2. Step 2: Convert to fraction form
   42,069.96/63,104.92 = 12,487.77/x
3. Step 3: Cross multiply
   42,069.96x = 63,104.92 × 12,487.77
4. Step 4: Simplify right side
   42,069.96x = 788,039,686.83
5. Step 5: Solve for x
   x = 788,039,686.83/42,069.96
6. Step 6: Final answer
   x = 18,731.65