Finding the Fourth Proportional to 1,109.94, 1,531.69 and 612.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.94 : 1,531.69 = 612.57 : x
2. Step 2: Convert to fraction form
   1,109.94/1,531.69 = 612.57/x
3. Step 3: Cross multiply
   1,109.94x = 1,531.69 × 612.57
4. Step 4: Simplify right side
   1,109.94x = 938,261.22
5. Step 5: Solve for x
   x = 938,261.22/1,109.94
6. Step 6: Final answer
   x = 845.33