Finding the Fourth Proportional to 140,638.72, 194,081.88 and 76,980.64

Step by Step Solution

1. Step 1: Write the proportion equation
   140,638.72 : 194,081.88 = 76,980.64 : x
2. Step 2: Convert to fraction form
   140,638.72/194,081.88 = 76,980.64/x
3. Step 3: Cross multiply
   140,638.72x = 194,081.88 × 76,980.64
4. Step 4: Simplify right side
   140,638.72x = 14,940,547,334.80
5. Step 5: Solve for x
   x = 14,940,547,334.80/140,638.72
6. Step 6: Final answer
   x = 106,233.53