Finding the Fourth Proportional to 42,468.60, 63,686.70 and 12,876.60

Step by Step Solution

1. Step 1: Write the proportion equation
   42,468.60 : 63,686.70 = 12,876.60 : x
2. Step 2: Convert to fraction form
   42,468.60/63,686.70 = 12,876.60/x
3. Step 3: Cross multiply
   42,468.60x = 63,686.70 × 12,876.60
4. Step 4: Simplify right side
   42,468.60x = 820,068,161.22
5. Step 5: Solve for x
   x = 820,068,161.22/42,468.60
6. Step 6: Final answer
   x = 19,309.99