Finding the Fourth Proportional to 1,077.31, 1,486.83 and 657.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,077.31 : 1,486.83 = 657.79 : x
2. Step 2: Convert to fraction form
   1,077.31/1,486.83 = 657.79/x
3. Step 3: Cross multiply
   1,077.31x = 1,486.83 × 657.79
4. Step 4: Simplify right side
   1,077.31x = 978,021.91
5. Step 5: Solve for x
   x = 978,021.91/1,077.31
6. Step 6: Final answer
   x = 907.84