Finding the Fourth Proportional to 1,208,713.34, 1,667,989.59 and 664,849.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,208,713.34 : 1,667,989.59 = 664,849.10 : x
2. Step 2: Convert to fraction form
   1,208,713.34/1,667,989.59 = 664,849.10/x
3. Step 3: Cross multiply
   1,208,713.34x = 1,667,989.59 × 664,849.10
4. Step 4: Simplify right side
   1,208,713.34x = 1,108,961,377,720.87
5. Step 5: Solve for x
   x = 1,108,961,377,720.87/1,208,713.34
6. Step 6: Final answer
   x = 917,472.61