Finding the Fourth Proportional to 155,078.82, 213,992.76 and 87,103.20

Step by Step Solution

1. Step 1: Write the proportion equation
   155,078.82 : 213,992.76 = 87,103.20 : x
2. Step 2: Convert to fraction form
   155,078.82/213,992.76 = 87,103.20/x
3. Step 3: Cross multiply
   155,078.82x = 213,992.76 × 87,103.20
4. Step 4: Simplify right side
   155,078.82x = 18,639,454,172.83
5. Step 5: Solve for x
   x = 18,639,454,172.83/155,078.82
6. Step 6: Final answer
   x = 120,193.42