Finding the Fourth Proportional to 326,028.78, 489,042.72 and 89,389.94

Step by Step Solution

1. Step 1: Write the proportion equation
   326,028.78 : 489,042.72 = 89,389.94 : x
2. Step 2: Convert to fraction form
   326,028.78/489,042.72 = 89,389.94/x
3. Step 3: Cross multiply
   326,028.78x = 489,042.72 × 89,389.94
4. Step 4: Simplify right side
   326,028.78x = 43,715,496,953.02
5. Step 5: Solve for x
   x = 43,715,496,953.02/326,028.78
6. Step 6: Final answer
   x = 134,084.78