Finding the Fourth Proportional to 1,308.16, 1,962.72 and 691.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,308.16 : 1,962.72 = 691.48 : x
2. Step 2: Convert to fraction form
   1,308.16/1,962.72 = 691.48/x
3. Step 3: Cross multiply
   1,308.16x = 1,962.72 × 691.48
4. Step 4: Simplify right side
   1,308.16x = 1,357,181.63
5. Step 5: Solve for x
   x = 1,357,181.63/1,308.16
6. Step 6: Final answer
   x = 1,037.47