Finding the Fourth Proportional to 43,059.40, 64,591.83 and 13,485.69

Step by Step Solution

1. Step 1: Write the proportion equation
   43,059.40 : 64,591.83 = 13,485.69 : x
2. Step 2: Convert to fraction form
   43,059.40/64,591.83 = 13,485.69/x
3. Step 3: Cross multiply
   43,059.40x = 64,591.83 × 13,485.69
4. Step 4: Simplify right side
   43,059.40x = 871,065,395.91
5. Step 5: Solve for x
   x = 871,065,395.91/43,059.40
6. Step 6: Final answer
   x = 20,229.39