Finding the Fourth Proportional to 1,207.69, 1,667.31 and 906.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,207.69 : 1,667.31 = 906.50 : x
2. Step 2: Convert to fraction form
   1,207.69/1,667.31 = 906.50/x
3. Step 3: Cross multiply
   1,207.69x = 1,667.31 × 906.50
4. Step 4: Simplify right side
   1,207.69x = 1,511,420.68
5. Step 5: Solve for x
   x = 1,511,420.68/1,207.69
6. Step 6: Final answer
   x = 1,251.50