Finding the Fourth Proportional to 718,086.47, 990,947.39 and 395,826.48

Step by Step Solution

1. Step 1: Write the proportion equation
   718,086.47 : 990,947.39 = 395,826.48 : x
2. Step 2: Convert to fraction form
   718,086.47/990,947.39 = 395,826.48/x
3. Step 3: Cross multiply
   718,086.47x = 990,947.39 × 395,826.48
4. Step 4: Simplify right side
   718,086.47x = 392,243,215,269.76
5. Step 5: Solve for x
   x = 392,243,215,269.76/718,086.47
6. Step 6: Final answer
   x = 546,233.96