Finding the Fourth Proportional to 1,208,123.33, 1,667,216.47 and 664,294.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,208,123.33 : 1,667,216.47 = 664,294.15 : x
2. Step 2: Convert to fraction form
   1,208,123.33/1,667,216.47 = 664,294.15/x
3. Step 3: Cross multiply
   1,208,123.33x = 1,667,216.47 × 664,294.15
4. Step 4: Simplify right side
   1,208,123.33x = 1,107,522,147,128.91
5. Step 5: Solve for x
   x = 1,107,522,147,128.91/1,208,123.33
6. Step 6: Final answer
   x = 916,729.38