Finding the Fourth Proportional to 140,656.87, 210,839.50 and 87,945.31

Step by Step Solution

1. Step 1: Write the proportion equation
   140,656.87 : 210,839.50 = 87,945.31 : x
2. Step 2: Convert to fraction form
   140,656.87/210,839.50 = 87,945.31/x
3. Step 3: Cross multiply
   140,656.87x = 210,839.50 × 87,945.31
4. Step 4: Simplify right side
   140,656.87x = 18,542,343,693.82
5. Step 5: Solve for x
   x = 18,542,343,693.82/140,656.87
6. Step 6: Final answer
   x = 131,826.79