Finding the Fourth Proportional to 328,016.39, 492,026.40 and 91,359.50

Step by Step Solution

1. Step 1: Write the proportion equation
   328,016.39 : 492,026.40 = 91,359.50 : x
2. Step 2: Convert to fraction form
   328,016.39/492,026.40 = 91,359.50/x
3. Step 3: Cross multiply
   328,016.39x = 492,026.40 × 91,359.50
4. Step 4: Simplify right side
   328,016.39x = 44,951,283,430.67
5. Step 5: Solve for x
   x = 44,951,283,430.67/328,016.39
6. Step 6: Final answer
   x = 137,039.75