Finding the Fourth Proportional to 43,251.50, 64,877.31 and 10,419.50

Step by Step Solution

1. Step 1: Write the proportion equation
   43,251.50 : 64,877.31 = 10,419.50 : x
2. Step 2: Convert to fraction form
   43,251.50/64,877.31 = 10,419.50/x
3. Step 3: Cross multiply
   43,251.50x = 64,877.31 × 10,419.50
4. Step 4: Simplify right side
   43,251.50x = 675,989,131.55
5. Step 5: Solve for x
   x = 675,989,131.55/43,251.50
6. Step 6: Final answer
   x = 15,629.26