Finding the Fourth Proportional to 806,223.37, 1,112,574.17 and 438,688.10

Step by Step Solution

1. Step 1: Write the proportion equation
   806,223.37 : 1,112,574.17 = 438,688.10 : x
2. Step 2: Convert to fraction form
   806,223.37/1,112,574.17 = 438,688.10/x
3. Step 3: Cross multiply
   806,223.37x = 1,112,574.17 × 438,688.10
4. Step 4: Simplify right side
   806,223.37x = 488,073,049,334.37
5. Step 5: Solve for x
   x = 488,073,049,334.37/806,223.37
6. Step 6: Final answer
   x = 605,381.92