Finding the Fourth Proportional to 215,640, 297,588.96 and 120,150.72

Step by Step Solution

1. Step 1: Write the proportion equation
   215,640 : 297,588.96 = 120,150.72 : x
2. Step 2: Convert to fraction form
   215,640/297,588.96 = 120,150.72/x
3. Step 3: Cross multiply
   215,640x = 297,588.96 × 120,150.72
4. Step 4: Simplify right side
   215,640x = 35,755,527,808.05
5. Step 5: Solve for x
   x = 35,755,527,808.05/215,640
6. Step 6: Final answer
   x = 165,811.20