Finding the Fourth Proportional to 1,208,406.27, 1,667,643.45 and 664,584.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,208,406.27 : 1,667,643.45 = 664,584.15 : x
2. Step 2: Convert to fraction form
   1,208,406.27/1,667,643.45 = 664,584.15/x
3. Step 3: Cross multiply
   1,208,406.27x = 1,667,643.45 × 664,584.15
4. Step 4: Simplify right side
   1,208,406.27x = 1,108,289,404,721.32
5. Step 5: Solve for x
   x = 1,108,289,404,721.32/1,208,406.27
6. Step 6: Final answer
   x = 917,149.66