Finding the Fourth Proportional to 216,152.55, 298,278.15 and 120,665.30

Step by Step Solution

1. Step 1: Write the proportion equation
   216,152.55 : 298,278.15 = 120,665.30 : x
2. Step 2: Convert to fraction form
   216,152.55/298,278.15 = 120,665.30/x
3. Step 3: Cross multiply
   216,152.55x = 298,278.15 × 120,665.30
4. Step 4: Simplify right side
   216,152.55x = 35,991,820,509.31
5. Step 5: Solve for x
   x = 35,991,820,509.31/216,152.55
6. Step 6: Final answer
   x = 166,511.20