Finding the Fourth Proportional to 323,648.02, 485,471.32 and 86,990.69

Step by Step Solution

1. Step 1: Write the proportion equation
   323,648.02 : 485,471.32 = 86,990.69 : x
2. Step 2: Convert to fraction form
   323,648.02/485,471.32 = 86,990.69/x
3. Step 3: Cross multiply
   323,648.02x = 485,471.32 × 86,990.69
4. Step 4: Simplify right side
   323,648.02x = 42,231,486,587.54
5. Step 5: Solve for x
   x = 42,231,486,587.54/323,648.02
6. Step 6: Final answer
   x = 130,485.85