Finding the Fourth Proportional to 42,876.37, 64,320.78 and 13,296.59

Step by Step Solution

1. Step 1: Write the proportion equation
   42,876.37 : 64,320.78 = 13,296.59 : x
2. Step 2: Convert to fraction form
   42,876.37/64,320.78 = 13,296.59/x
3. Step 3: Cross multiply
   42,876.37x = 64,320.78 × 13,296.59
4. Step 4: Simplify right side
   42,876.37x = 855,247,040.14
5. Step 5: Solve for x
   x = 855,247,040.14/42,876.37
6. Step 6: Final answer
   x = 19,946.82