Finding the Fourth Proportional to 143,757.58, 215,359.99 and 80,385.49

Step by Step Solution

1. Step 1: Write the proportion equation
   143,757.58 : 215,359.99 = 80,385.49 : x
2. Step 2: Convert to fraction form
   143,757.58/215,359.99 = 80,385.49/x
3. Step 3: Cross multiply
   143,757.58x = 215,359.99 × 80,385.49
4. Step 4: Simplify right side
   143,757.58x = 17,311,818,322.55
5. Step 5: Solve for x
   x = 17,311,818,322.55/143,757.58
6. Step 6: Final answer
   x = 120,423.69