Finding the Fourth Proportional to 328,290.72, 492,348.48 and 91,591.80

Step by Step Solution

1. Step 1: Write the proportion equation
   328,290.72 : 492,348.48 = 91,591.80 : x
2. Step 2: Convert to fraction form
   328,290.72/492,348.48 = 91,591.80/x
3. Step 3: Cross multiply
   328,290.72x = 492,348.48 × 91,591.80
4. Step 4: Simplify right side
   328,290.72x = 45,095,083,510.46
5. Step 5: Solve for x
   x = 45,095,083,510.46/328,290.72
6. Step 6: Final answer
   x = 137,363.26