Finding the Fourth Proportional to 309,947,496.60, 464,978,456.83 and 128,208,846.36

Step by Step Solution

1. Step 1: Write the proportion equation
   309,947,496.60 : 464,978,456.83 = 128,208,846.36 : x
2. Step 2: Convert to fraction form
   309,947,496.60/464,978,456.83 = 128,208,846.36/x
3. Step 3: Cross multiply
   309,947,496.60x = 464,978,456.83 × 128,208,846.36
4. Step 4: Simplify right side
   309,947,496.60x = 59,614,351,533,610,760
5. Step 5: Solve for x
   x = 59,614,351,533,610,760/309,947,496.60
6. Step 6: Final answer
   x = 192,336,935.08