Finding the Fourth Proportional to 1,037.59, 1,431.98 and 775.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,037.59 : 1,431.98 = 775.15 : x
2. Step 2: Convert to fraction form
   1,037.59/1,431.98 = 775.15/x
3. Step 3: Cross multiply
   1,037.59x = 1,431.98 × 775.15
4. Step 4: Simplify right side
   1,037.59x = 1,109,999.30
5. Step 5: Solve for x
   x = 1,109,999.30/1,037.59
6. Step 6: Final answer
   x = 1,069.79