Finding the Fourth Proportional to 1,109.47, 1,531.03 and 612.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.47 : 1,531.03 = 612.10 : x
2. Step 2: Convert to fraction form
   1,109.47/1,531.03 = 612.10/x
3. Step 3: Cross multiply
   1,109.47x = 1,531.03 × 612.10
4. Step 4: Simplify right side
   1,109.47x = 937,143.46
5. Step 5: Solve for x
   x = 937,143.46/1,109.47
6. Step 6: Final answer
   x = 844.68