Finding the Fourth Proportional to 1,109.50, 1,531.02 and 612.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.50 : 1,531.02 = 612.02 : x
2. Step 2: Convert to fraction form
   1,109.50/1,531.02 = 612.02/x
3. Step 3: Cross multiply
   1,109.50x = 1,531.02 × 612.02
4. Step 4: Simplify right side
   1,109.50x = 937,014.86
5. Step 5: Solve for x
   x = 937,014.86/1,109.50
6. Step 6: Final answer
   x = 844.54