Finding the Fourth Proportional to 328,111.98, 492,209.01 and 128,406.57

Step by Step Solution

1. Step 1: Write the proportion equation
   328,111.98 : 492,209.01 = 128,406.57 : x
2. Step 2: Convert to fraction form
   328,111.98/492,209.01 = 128,406.57/x
3. Step 3: Cross multiply
   328,111.98x = 492,209.01 × 128,406.57
4. Step 4: Simplify right side
   328,111.98x = 63,202,870,697.20
5. Step 5: Solve for x
   x = 63,202,870,697.20/328,111.98
6. Step 6: Final answer
   x = 192,625.92