Finding the Fourth Proportional to 439,345.72, 659,018.64 and 106,921.72

Step by Step Solution

1. Step 1: Write the proportion equation
   439,345.72 : 659,018.64 = 106,921.72 : x
2. Step 2: Convert to fraction form
   439,345.72/659,018.64 = 106,921.72/x
3. Step 3: Cross multiply
   439,345.72x = 659,018.64 × 106,921.72
4. Step 4: Simplify right side
   439,345.72x = 70,463,406,500.86
5. Step 5: Solve for x
   x = 70,463,406,500.86/439,345.72
6. Step 6: Final answer
   x = 160,382.59