Finding the Fourth Proportional to 140,683.32, 210,956.94 and 51,978.60

Step by Step Solution

1. Step 1: Write the proportion equation
   140,683.32 : 210,956.94 = 51,978.60 : x
2. Step 2: Convert to fraction form
   140,683.32/210,956.94 = 51,978.60/x
3. Step 3: Cross multiply
   140,683.32x = 210,956.94 × 51,978.60
4. Step 4: Simplify right side
   140,683.32x = 10,965,246,401.48
5. Step 5: Solve for x
   x = 10,965,246,401.48/140,683.32
6. Step 6: Final answer
   x = 77,942.76