Finding the Fourth Proportional to 656,784.05, 906,361.58 and 354,978.05

Step by Step Solution

1. Step 1: Write the proportion equation
   656,784.05 : 906,361.58 = 354,978.05 : x
2. Step 2: Convert to fraction form
   656,784.05/906,361.58 = 354,978.05/x
3. Step 3: Cross multiply
   656,784.05x = 906,361.58 × 354,978.05
4. Step 4: Simplify right side
   656,784.05x = 321,738,466,263.32
5. Step 5: Solve for x
   x = 321,738,466,263.32/656,784.05
6. Step 6: Final answer
   x = 489,869.49