Finding the Fourth Proportional to 498,300.72, 687,445.56 and 347,485.20

Step by Step Solution

1. Step 1: Write the proportion equation
   498,300.72 : 687,445.56 = 347,485.20 : x
2. Step 2: Convert to fraction form
   498,300.72/687,445.56 = 347,485.20/x
3. Step 3: Cross multiply
   498,300.72x = 687,445.56 × 347,485.20
4. Step 4: Simplify right side
   498,300.72x = 238,877,157,905.71
5. Step 5: Solve for x
   x = 238,877,157,905.71/498,300.72
6. Step 6: Final answer
   x = 479,383.53