Finding the Fourth Proportional to 150,321.78, 207,443.61 and 86,659.02

Step by Step Solution

1. Step 1: Write the proportion equation
   150,321.78 : 207,443.61 = 86,659.02 : x
2. Step 2: Convert to fraction form
   150,321.78/207,443.61 = 86,659.02/x
3. Step 3: Cross multiply
   150,321.78x = 207,443.61 × 86,659.02
4. Step 4: Simplify right side
   150,321.78x = 17,976,859,947.86
5. Step 5: Solve for x
   x = 17,976,859,947.86/150,321.78
6. Step 6: Final answer
   x = 119,589.19