Finding the Fourth Proportional to 158,661.36, 218,941.56 and 87,039.72

Step by Step Solution

1. Step 1: Write the proportion equation
   158,661.36 : 218,941.56 = 87,039.72 : x
2. Step 2: Convert to fraction form
   158,661.36/218,941.56 = 87,039.72/x
3. Step 3: Cross multiply
   158,661.36x = 218,941.56 × 87,039.72
4. Step 4: Simplify right side
   158,661.36x = 19,056,612,078.76
5. Step 5: Solve for x
   x = 19,056,612,078.76/158,661.36
6. Step 6: Final answer
   x = 120,108.72