Finding the Fourth Proportional to 686,300.59, 947,129.72 and 395,804.15

Step by Step Solution

1. Step 1: Write the proportion equation
   686,300.59 : 947,129.72 = 395,804.15 : x
2. Step 2: Convert to fraction form
   686,300.59/947,129.72 = 395,804.15/x
3. Step 3: Cross multiply
   686,300.59x = 947,129.72 × 395,804.15
4. Step 4: Simplify right side
   686,300.59x = 374,877,867,049.67
5. Step 5: Solve for x
   x = 374,877,867,049.67/686,300.59
6. Step 6: Final answer
   x = 546,229.85