Finding the Fourth Proportional to 42,825.43, 64,244.32 and 13,245.57

Step by Step Solution

1. Step 1: Write the proportion equation
   42,825.43 : 64,244.32 = 13,245.57 : x
2. Step 2: Convert to fraction form
   42,825.43/64,244.32 = 13,245.57/x
3. Step 3: Cross multiply
   42,825.43x = 64,244.32 × 13,245.57
4. Step 4: Simplify right side
   42,825.43x = 850,952,604.55
5. Step 5: Solve for x
   x = 850,952,604.55/42,825.43
6. Step 6: Final answer
   x = 19,870.26