Finding the Fourth Proportional to 140,978.28, 194,549.12 and 80,567.40

Step by Step Solution

1. Step 1: Write the proportion equation
   140,978.28 : 194,549.12 = 80,567.40 : x
2. Step 2: Convert to fraction form
   140,978.28/194,549.12 = 80,567.40/x
3. Step 3: Cross multiply
   140,978.28x = 194,549.12 × 80,567.40
4. Step 4: Simplify right side
   140,978.28x = 15,674,316,770.69
5. Step 5: Solve for x
   x = 15,674,316,770.69/140,978.28
6. Step 6: Final answer
   x = 111,182.49