Finding the Fourth Proportional to 1,208,406.15, 1,667,643.27 and 664,584.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,208,406.15 : 1,667,643.27 = 664,584.03 : x
2. Step 2: Convert to fraction form
   1,208,406.15/1,667,643.27 = 664,584.03/x
3. Step 3: Cross multiply
   1,208,406.15x = 1,667,643.27 × 664,584.03
4. Step 4: Simplify right side
   1,208,406.15x = 1,108,289,084,978.98
5. Step 5: Solve for x
   x = 1,108,289,084,978.98/1,208,406.15
6. Step 6: Final answer
   x = 917,149.49