Finding the Fourth Proportional to 140,636.72, 194,079.12 and 76,978.64

Step by Step Solution

1. Step 1: Write the proportion equation
   140,636.72 : 194,079.12 = 76,978.64 : x
2. Step 2: Convert to fraction form
   140,636.72/194,079.12 = 76,978.64/x
3. Step 3: Cross multiply
   140,636.72x = 194,079.12 × 76,978.64
4. Step 4: Simplify right side
   140,636.72x = 14,939,946,710.00
5. Step 5: Solve for x
   x = 14,939,946,710.00/140,636.72
6. Step 6: Final answer
   x = 106,230.77