Finding the Fourth Proportional to 1,109.87, 1,531.91 and 711.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.87 : 1,531.91 = 711.50 : x
2. Step 2: Convert to fraction form
   1,109.87/1,531.91 = 711.50/x
3. Step 3: Cross multiply
   1,109.87x = 1,531.91 × 711.50
4. Step 4: Simplify right side
   1,109.87x = 1,089,942.75
5. Step 5: Solve for x
   x = 1,089,942.75/1,109.87
6. Step 6: Final answer
   x = 982.05