Finding the Fourth Proportional to 143,685.88, 198,278.72 and 79,142.56

Step by Step Solution

1. Step 1: Write the proportion equation
   143,685.88 : 198,278.72 = 79,142.56 : x
2. Step 2: Convert to fraction form
   143,685.88/198,278.72 = 79,142.56/x
3. Step 3: Cross multiply
   143,685.88x = 198,278.72 × 79,142.56
4. Step 4: Simplify right side
   143,685.88x = 15,692,285,494.32
5. Step 5: Solve for x
   x = 15,692,285,494.32/143,685.88
6. Step 6: Final answer
   x = 109,212.44