Finding the Fourth Proportional to 647,978.25, 972,401.22 and 268,899.35

Step by Step Solution

1. Step 1: Write the proportion equation
   647,978.25 : 972,401.22 = 268,899.35 : x
2. Step 2: Convert to fraction form
   647,978.25/972,401.22 = 268,899.35/x
3. Step 3: Cross multiply
   647,978.25x = 972,401.22 × 268,899.35
4. Step 4: Simplify right side
   647,978.25x = 261,478,054,652.71
5. Step 5: Solve for x
   x = 261,478,054,652.71/647,978.25
6. Step 6: Final answer
   x = 403,529.06