Finding the Fourth Proportional to 42,856, 64,287.24 and 13,276.82

Step by Step Solution

1. Step 1: Write the proportion equation
   42,856 : 64,287.24 = 13,276.82 : x
2. Step 2: Convert to fraction form
   42,856/64,287.24 = 13,276.82/x
3. Step 3: Cross multiply
   42,856x = 64,287.24 × 13,276.82
4. Step 4: Simplify right side
   42,856x = 853,530,113.78
5. Step 5: Solve for x
   x = 853,530,113.78/42,856
6. Step 6: Final answer
   x = 19,916.23