Finding the Fourth Proportional to 328,111.59, 492,208.43 and 128,406.18

Step by Step Solution

1. Step 1: Write the proportion equation
   328,111.59 : 492,208.43 = 128,406.18 : x
2. Step 2: Convert to fraction form
   328,111.59/492,208.43 = 128,406.18/x
3. Step 3: Cross multiply
   328,111.59x = 492,208.43 × 128,406.18
4. Step 4: Simplify right side
   328,111.59x = 63,202,604,260.10
5. Step 5: Solve for x
   x = 63,202,604,260.10/328,111.59
6. Step 6: Final answer
   x = 192,625.33