Finding the Fourth Proportional to 353,367.72, 487,638.72 and 202,455

Step by Step Solution

1. Step 1: Write the proportion equation
   353,367.72 : 487,638.72 = 202,455 : x
2. Step 2: Convert to fraction form
   353,367.72/487,638.72 = 202,455/x
3. Step 3: Cross multiply
   353,367.72x = 487,638.72 × 202,455
4. Step 4: Simplify right side
   353,367.72x = 98,724,897,057.60
5. Step 5: Solve for x
   x = 98,724,897,057.60/353,367.72
6. Step 6: Final answer
   x = 279,382.90