Finding the Fourth Proportional to 42,760.20, 64,147.32 and 13,178.04

Step by Step Solution

1. Step 1: Write the proportion equation
   42,760.20 : 64,147.32 = 13,178.04 : x
2. Step 2: Convert to fraction form
   42,760.20/64,147.32 = 13,178.04/x
3. Step 3: Cross multiply
   42,760.20x = 64,147.32 × 13,178.04
4. Step 4: Simplify right side
   42,760.20x = 845,335,948.85
5. Step 5: Solve for x
   x = 845,335,948.85/42,760.20
6. Step 6: Final answer
   x = 19,769.22