Finding the Fourth Proportional to 686,727.72, 947,782.32 and 380,872.10

Step by Step Solution

1. Step 1: Write the proportion equation
   686,727.72 : 947,782.32 = 380,872.10 : x
2. Step 2: Convert to fraction form
   686,727.72/947,782.32 = 380,872.10/x
3. Step 3: Cross multiply
   686,727.72x = 947,782.32 × 380,872.10
4. Step 4: Simplify right side
   686,727.72x = 360,983,842,561.27
5. Step 5: Solve for x
   x = 360,983,842,561.27/686,727.72
6. Step 6: Final answer
   x = 525,657.89