Finding the Fourth Proportional to 686,645.82, 947,582.61 and 380,735.10

Step by Step Solution

1. Step 1: Write the proportion equation
   686,645.82 : 947,582.61 = 380,735.10 : x
2. Step 2: Convert to fraction form
   686,645.82/947,582.61 = 380,735.10/x
3. Step 3: Cross multiply
   686,645.82x = 947,582.61 × 380,735.10
4. Step 4: Simplify right side
   686,645.82x = 360,777,959,776.61
5. Step 5: Solve for x
   x = 360,777,959,776.61/686,645.82
6. Step 6: Final answer
   x = 525,420.75