Finding the Fourth Proportional to 140,304.72, 210,540.05 and 51,620.45

Step by Step Solution

1. Step 1: Write the proportion equation
   140,304.72 : 210,540.05 = 51,620.45 : x
2. Step 2: Convert to fraction form
   140,304.72/210,540.05 = 51,620.45/x
3. Step 3: Cross multiply
   140,304.72x = 210,540.05 × 51,620.45
4. Step 4: Simplify right side
   140,304.72x = 10,868,171,865.92
5. Step 5: Solve for x
   x = 10,868,171,865.92/140,304.72
6. Step 6: Final answer
   x = 77,461.20