Finding the Fourth Proportional to 1,109.71, 1,531.39 and 612.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.71 : 1,531.39 = 612.37 : x
2. Step 2: Convert to fraction form
   1,109.71/1,531.39 = 612.37/x
3. Step 3: Cross multiply
   1,109.71x = 1,531.39 × 612.37
4. Step 4: Simplify right side
   1,109.71x = 937,777.29
5. Step 5: Solve for x
   x = 937,777.29/1,109.71
6. Step 6: Final answer
   x = 845.07