Finding the Fourth Proportional to 1,109.39, 1,530.98 and 612.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.39 : 1,530.98 = 612.05 : x
2. Step 2: Convert to fraction form
   1,109.39/1,530.98 = 612.05/x
3. Step 3: Cross multiply
   1,109.39x = 1,530.98 × 612.05
4. Step 4: Simplify right side
   1,109.39x = 937,025.59
5. Step 5: Solve for x
   x = 937,025.59/1,109.39
6. Step 6: Final answer
   x = 844.64