Finding the Fourth Proportional to 158,815.55, 219,165.89 and 87,200.21

Step by Step Solution

1. Step 1: Write the proportion equation
   158,815.55 : 219,165.89 = 87,200.21 : x
2. Step 2: Convert to fraction form
   158,815.55/219,165.89 = 87,200.21/x
3. Step 3: Cross multiply
   158,815.55x = 219,165.89 × 87,200.21
4. Step 4: Simplify right side
   158,815.55x = 19,111,311,632.84
5. Step 5: Solve for x
   x = 19,111,311,632.84/158,815.55
6. Step 6: Final answer
   x = 120,336.53