Finding the Fourth Proportional to 323,647.33, 485,470.29 and 86,990.01

Step by Step Solution

1. Step 1: Write the proportion equation
   323,647.33 : 485,470.29 = 86,990.01 : x
2. Step 2: Convert to fraction form
   323,647.33/485,470.29 = 86,990.01/x
3. Step 3: Cross multiply
   323,647.33x = 485,470.29 × 86,990.01
4. Step 4: Simplify right side
   323,647.33x = 42,231,062,954.45
5. Step 5: Solve for x
   x = 42,231,062,954.45/323,647.33
6. Step 6: Final answer
   x = 130,484.82