Finding the Fourth Proportional to 308,117.86, 461,978.90 and 128,327.96

Step by Step Solution

1. Step 1: Write the proportion equation
   308,117.86 : 461,978.90 = 128,327.96 : x
2. Step 2: Convert to fraction form
   308,117.86/461,978.90 = 128,327.96/x
3. Step 3: Cross multiply
   308,117.86x = 461,978.90 × 128,327.96
4. Step 4: Simplify right side
   308,117.86x = 59,284,809,800.04
5. Step 5: Solve for x
   x = 59,284,809,800.04/308,117.86
6. Step 6: Final answer
   x = 192,409.52