Finding the Fourth Proportional to 1,105.65, 1,525.59 and 712.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,105.65 : 1,525.59 = 712.98 : x
2. Step 2: Convert to fraction form
   1,105.65/1,525.59 = 712.98/x
3. Step 3: Cross multiply
   1,105.65x = 1,525.59 × 712.98
4. Step 4: Simplify right side
   1,105.65x = 1,087,715.16
5. Step 5: Solve for x
   x = 1,087,715.16/1,105.65
6. Step 6: Final answer
   x = 983.78