Finding the Fourth Proportional to 449,039,308.96, 673,583,108.72 and 142,355,336.68

Step by Step Solution

1. Step 1: Write the proportion equation
   449,039,308.96 : 673,583,108.72 = 142,355,336.68 : x
2. Step 2: Convert to fraction form
   449,039,308.96/673,583,108.72 = 142,355,336.68/x
3. Step 3: Cross multiply
   449,039,308.96x = 673,583,108.72 × 142,355,336.68
4. Step 4: Simplify right side
   449,039,308.96x = 95,888,150,223,796,656
5. Step 5: Solve for x
   x = 95,888,150,223,796,656/449,039,308.96
6. Step 6: Final answer
   x = 213,540,659.60