Finding the Fourth Proportional to 1,011,792.38, 1,396,415.90 and 644,152.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,011,792.38 : 1,396,415.90 = 644,152.10 : x
2. Step 2: Convert to fraction form
   1,011,792.38/1,396,415.90 = 644,152.10/x
3. Step 3: Cross multiply
   1,011,792.38x = 1,396,415.90 × 644,152.10
4. Step 4: Simplify right side
   1,011,792.38x = 899,504,229,086.69
5. Step 5: Solve for x
   x = 899,504,229,086.69/1,011,792.38
6. Step 6: Final answer
   x = 889,020.57