Finding the Fourth Proportional to 657,016.56, 906,684.96 and 355,212.72

Step by Step Solution

1. Step 1: Write the proportion equation
   657,016.56 : 906,684.96 = 355,212.72 : x
2. Step 2: Convert to fraction form
   657,016.56/906,684.96 = 355,212.72/x
3. Step 3: Cross multiply
   657,016.56x = 906,684.96 × 355,212.72
4. Step 4: Simplify right side
   657,016.56x = 322,066,030,824.69
5. Step 5: Solve for x
   x = 322,066,030,824.69/657,016.56
6. Step 6: Final answer
   x = 490,194.69