Finding the Fourth Proportional to 42,757.98, 64,143 and 13,178.22

Step by Step Solution

1. Step 1: Write the proportion equation
   42,757.98 : 64,143 = 13,178.22 : x
2. Step 2: Convert to fraction form
   42,757.98/64,143 = 13,178.22/x
3. Step 3: Cross multiply
   42,757.98x = 64,143 × 13,178.22
4. Step 4: Simplify right side
   42,757.98x = 845,290,565.46
5. Step 5: Solve for x
   x = 845,290,565.46/42,757.98
6. Step 6: Final answer
   x = 19,769.19