Finding the Fourth Proportional to 158,606.31, 218,879.52 and 86,985.69

Step by Step Solution

1. Step 1: Write the proportion equation
   158,606.31 : 218,879.52 = 86,985.69 : x
2. Step 2: Convert to fraction form
   158,606.31/218,879.52 = 86,985.69/x
3. Step 3: Cross multiply
   158,606.31x = 218,879.52 × 86,985.69
4. Step 4: Simplify right side
   158,606.31x = 19,039,386,074.07
5. Step 5: Solve for x
   x = 19,039,386,074.07/158,606.31
6. Step 6: Final answer
   x = 120,041.79