Finding the Fourth Proportional to 1,039,685.40, 1,558,860.72 and 432,894.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,039,685.40 : 1,558,860.72 = 432,894.05 : x
2. Step 2: Convert to fraction form
   1,039,685.40/1,558,860.72 = 432,894.05/x
3. Step 3: Cross multiply
   1,039,685.40x = 1,558,860.72 × 432,894.05
4. Step 4: Simplify right side
   1,039,685.40x = 674,821,530,466.72
5. Step 5: Solve for x
   x = 674,821,530,466.72/1,039,685.40
6. Step 6: Final answer
   x = 649,063.20