Finding the Fourth Proportional to 42,875.27, 64,315.34 and 13,297.31

Step by Step Solution

1. Step 1: Write the proportion equation
   42,875.27 : 64,315.34 = 13,297.31 : x
2. Step 2: Convert to fraction form
   42,875.27/64,315.34 = 13,297.31/x
3. Step 3: Cross multiply
   42,875.27x = 64,315.34 × 13,297.31
4. Step 4: Simplify right side
   42,875.27x = 855,220,947.25
5. Step 5: Solve for x
   x = 855,220,947.25/42,875.27
6. Step 6: Final answer
   x = 19,946.72