Finding the Fourth Proportional to 396,498.27, 547,152.98 and 215,206.34

Step by Step Solution

1. Step 1: Write the proportion equation
   396,498.27 : 547,152.98 = 215,206.34 : x
2. Step 2: Convert to fraction form
   396,498.27/547,152.98 = 215,206.34/x
3. Step 3: Cross multiply
   396,498.27x = 547,152.98 × 215,206.34
4. Step 4: Simplify right side
   396,498.27x = 117,750,786,434.10
5. Step 5: Solve for x
   x = 117,750,786,434.10/396,498.27
6. Step 6: Final answer
   x = 296,976.79