Finding the Fourth Proportional to 647,978.37, 972,401.40 and 268,899.47

Step by Step Solution

1. Step 1: Write the proportion equation
   647,978.37 : 972,401.40 = 268,899.47 : x
2. Step 2: Convert to fraction form
   647,978.37/972,401.40 = 268,899.47/x
3. Step 3: Cross multiply
   647,978.37x = 972,401.40 × 268,899.47
4. Step 4: Simplify right side
   647,978.37x = 261,478,223,518.26
5. Step 5: Solve for x
   x = 261,478,223,518.26/647,978.37
6. Step 6: Final answer
   x = 403,529.25