Finding the Fourth Proportional to 1,208,404.88, 1,667,565.48 and 664,540.67

Step by Step Solution

1. Step 1: Write the proportion equation
   1,208,404.88 : 1,667,565.48 = 664,540.67 : x
2. Step 2: Convert to fraction form
   1,208,404.88/1,667,565.48 = 664,540.67/x
3. Step 3: Cross multiply
   1,208,404.88x = 1,667,565.48 × 664,540.67
4. Step 4: Simplify right side
   1,208,404.88x = 1,108,165,085,078.46
5. Step 5: Solve for x
   x = 1,108,165,085,078.46/1,208,404.88
6. Step 6: Final answer
   x = 917,047.84