Finding the Fourth Proportional to 1,109.89, 1,530.66 and 716.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.89 : 1,530.66 = 716.50 : x
2. Step 2: Convert to fraction form
   1,109.89/1,530.66 = 716.50/x
3. Step 3: Cross multiply
   1,109.89x = 1,530.66 × 716.50
4. Step 4: Simplify right side
   1,109.89x = 1,096,717.89
5. Step 5: Solve for x
   x = 1,096,717.89/1,109.89
6. Step 6: Final answer
   x = 988.13