Finding the Fourth Proportional to 323,789.90, 485,641.10 and 87,146.78

Step by Step Solution

1. Step 1: Write the proportion equation
   323,789.90 : 485,641.10 = 87,146.78 : x
2. Step 2: Convert to fraction form
   323,789.90/485,641.10 = 87,146.78/x
3. Step 3: Cross multiply
   323,789.90x = 485,641.10 × 87,146.78
4. Step 4: Simplify right side
   323,789.90x = 42,322,055,236.72
5. Step 5: Solve for x
   x = 42,322,055,236.72/323,789.90
6. Step 6: Final answer
   x = 130,708.39