Finding the Fourth Proportional to 42,760.34, 64,147.39 and 13,178.16

Step by Step Solution

1. Step 1: Write the proportion equation
   42,760.34 : 64,147.39 = 13,178.16 : x
2. Step 2: Convert to fraction form
   42,760.34/64,147.39 = 13,178.16/x
3. Step 3: Cross multiply
   42,760.34x = 64,147.39 × 13,178.16
4. Step 4: Simplify right side
   42,760.34x = 845,344,569.00
5. Step 5: Solve for x
   x = 845,344,569.00/42,760.34
6. Step 6: Final answer
   x = 19,769.36