Finding the Fourth Proportional to 726,664.72, 1,002,789.35 and 399,970.75

Step by Step Solution

1. Step 1: Write the proportion equation
   726,664.72 : 1,002,789.35 = 399,970.75 : x
2. Step 2: Convert to fraction form
   726,664.72/1,002,789.35 = 399,970.75/x
3. Step 3: Cross multiply
   726,664.72x = 1,002,789.35 × 399,970.75
4. Step 4: Simplify right side
   726,664.72x = 401,086,408,411.51
5. Step 5: Solve for x
   x = 401,086,408,411.51/726,664.72
6. Step 6: Final answer
   x = 551,955.25