Finding the Fourth Proportional to 140,158.56, 210,168.72 and 51,345.12

Step by Step Solution

1. Step 1: Write the proportion equation
   140,158.56 : 210,168.72 = 51,345.12 : x
2. Step 2: Convert to fraction form
   140,158.56/210,168.72 = 51,345.12/x
3. Step 3: Cross multiply
   140,158.56x = 210,168.72 × 51,345.12
4. Step 4: Simplify right side
   140,158.56x = 10,791,138,148.65
5. Step 5: Solve for x
   x = 10,791,138,148.65/140,158.56
6. Step 6: Final answer
   x = 76,992.36