Finding the Fourth Proportional to 1,109.82, 1,531.59 and 612.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.82 : 1,531.59 = 612.48 : x
2. Step 2: Convert to fraction form
   1,109.82/1,531.59 = 612.48/x
3. Step 3: Cross multiply
   1,109.82x = 1,531.59 × 612.48
4. Step 4: Simplify right side
   1,109.82x = 938,068.24
5. Step 5: Solve for x
   x = 938,068.24/1,109.82
6. Step 6: Final answer
   x = 845.24