Finding the Fourth Proportional to 326,441.32, 489,605.55 and 86,556.76

Step by Step Solution

1. Step 1: Write the proportion equation
   326,441.32 : 489,605.55 = 86,556.76 : x
2. Step 2: Convert to fraction form
   326,441.32/489,605.55 = 86,556.76/x
3. Step 3: Cross multiply
   326,441.32x = 489,605.55 × 86,556.76
4. Step 4: Simplify right side
   326,441.32x = 42,378,670,086.02
5. Step 5: Solve for x
   x = 42,378,670,086.02/326,441.32
6. Step 6: Final answer
   x = 129,820.18