Finding the Fourth Proportional to 42,880.37, 64,326.78 and 13,300.59

Step by Step Solution

1. Step 1: Write the proportion equation
   42,880.37 : 64,326.78 = 13,300.59 : x
2. Step 2: Convert to fraction form
   42,880.37/64,326.78 = 13,300.59/x
3. Step 3: Cross multiply
   42,880.37x = 64,326.78 × 13,300.59
4. Step 4: Simplify right side
   42,880.37x = 855,584,126.80
5. Step 5: Solve for x
   x = 855,584,126.80/42,880.37
6. Step 6: Final answer
   x = 19,952.82