Finding the Fourth Proportional to 1,109.84, 1,531.56 and 612.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.84 : 1,531.56 = 612.46 : x
2. Step 2: Convert to fraction form
   1,109.84/1,531.56 = 612.46/x
3. Step 3: Cross multiply
   1,109.84x = 1,531.56 × 612.46
4. Step 4: Simplify right side
   1,109.84x = 938,020.00
5. Step 5: Solve for x
   x = 938,020.00/1,109.84
6. Step 6: Final answer
   x = 845.19