Finding the Fourth Proportional to 1,109.93, 1,531.50 and 612.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.93 : 1,531.50 = 612.47 : x
2. Step 2: Convert to fraction form
   1,109.93/1,531.50 = 612.47/x
3. Step 3: Cross multiply
   1,109.93x = 1,531.50 × 612.47
4. Step 4: Simplify right side
   1,109.93x = 937,990.15
5. Step 5: Solve for x
   x = 937,990.15/1,109.93
6. Step 6: Final answer
   x = 845.09