Finding the Fourth Proportional to 1,037.89, 1,431.50 and 723.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,037.89 : 1,431.50 = 723.15 : x
2. Step 2: Convert to fraction form
   1,037.89/1,431.50 = 723.15/x
3. Step 3: Cross multiply
   1,037.89x = 1,431.50 × 723.15
4. Step 4: Simplify right side
   1,037.89x = 1,035,193.69
5. Step 5: Solve for x
   x = 1,035,193.69/1,037.89
6. Step 6: Final answer
   x = 997.40