Finding the Fourth Proportional to 1,109.91, 1,531.68 and 612.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.91 : 1,531.68 = 612.54 : x
2. Step 2: Convert to fraction form
   1,109.91/1,531.68 = 612.54/x
3. Step 3: Cross multiply
   1,109.91x = 1,531.68 × 612.54
4. Step 4: Simplify right side
   1,109.91x = 938,215.27
5. Step 5: Solve for x
   x = 938,215.27/1,109.91
6. Step 6: Final answer
   x = 845.31