Finding the Fourth Proportional to 42,894.57, 64,350.37 and 13,311.15

Step by Step Solution

1. Step 1: Write the proportion equation
   42,894.57 : 64,350.37 = 13,311.15 : x
2. Step 2: Convert to fraction form
   42,894.57/64,350.37 = 13,311.15/x
3. Step 3: Cross multiply
   42,894.57x = 64,350.37 × 13,311.15
4. Step 4: Simplify right side
   42,894.57x = 856,577,153.03
5. Step 5: Solve for x
   x = 856,577,153.03/42,894.57
6. Step 6: Final answer
   x = 19,969.36