Finding the Fourth Proportional to 1,199.31, 1,654.94 and 668.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,199.31 : 1,654.94 = 668.15 : x
2. Step 2: Convert to fraction form
   1,199.31/1,654.94 = 668.15/x
3. Step 3: Cross multiply
   1,199.31x = 1,654.94 × 668.15
4. Step 4: Simplify right side
   1,199.31x = 1,105,741.56
5. Step 5: Solve for x
   x = 1,105,741.56/1,199.31
6. Step 6: Final answer
   x = 921.98