Finding the Fourth Proportional to 140,029.31, 210,076.83 and 86,054.15

Step by Step Solution

1. Step 1: Write the proportion equation
   140,029.31 : 210,076.83 = 86,054.15 : x
2. Step 2: Convert to fraction form
   140,029.31/210,076.83 = 86,054.15/x
3. Step 3: Cross multiply
   140,029.31x = 210,076.83 × 86,054.15
4. Step 4: Simplify right side
   140,029.31x = 18,077,981,989.96
5. Step 5: Solve for x
   x = 18,077,981,989.96/140,029.31
6. Step 6: Final answer
   x = 129,101.42