Finding the Fourth Proportional to 140,643.32, 194,089.60 and 76,979.75

Step by Step Solution

1. Step 1: Write the proportion equation
   140,643.32 : 194,089.60 = 76,979.75 : x
2. Step 2: Convert to fraction form
   140,643.32/194,089.60 = 76,979.75/x
3. Step 3: Cross multiply
   140,643.32x = 194,089.60 × 76,979.75
4. Step 4: Simplify right side
   140,643.32x = 14,940,967,915.15
5. Step 5: Solve for x
   x = 14,940,967,915.15/140,643.32
6. Step 6: Final answer
   x = 106,233.05