Finding the Fourth Proportional to 42,844.43, 64,269.38 and 13,259.78

Step by Step Solution

1. Step 1: Write the proportion equation
   42,844.43 : 64,269.38 = 13,259.78 : x
2. Step 2: Convert to fraction form
   42,844.43/64,269.38 = 13,259.78/x
3. Step 3: Cross multiply
   42,844.43x = 64,269.38 × 13,259.78
4. Step 4: Simplify right side
   42,844.43x = 852,197,933.91
5. Step 5: Solve for x
   x = 852,197,933.91/42,844.43
6. Step 6: Final answer
   x = 19,890.52