Finding the Fourth Proportional to 42,876.27, 64,316.84 and 13,298.31

Step by Step Solution

1. Step 1: Write the proportion equation
   42,876.27 : 64,316.84 = 13,298.31 : x
2. Step 2: Convert to fraction form
   42,876.27/64,316.84 = 13,298.31/x
3. Step 3: Cross multiply
   42,876.27x = 64,316.84 × 13,298.31
4. Step 4: Simplify right side
   42,876.27x = 855,305,276.54
5. Step 5: Solve for x
   x = 855,305,276.54/42,876.27
6. Step 6: Final answer
   x = 19,948.22