Finding the Fourth Proportional to 1,109.94, 1,531.72 and 612.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.94 : 1,531.72 = 612.59 : x
2. Step 2: Convert to fraction form
   1,109.94/1,531.72 = 612.59/x
3. Step 3: Cross multiply
   1,109.94x = 1,531.72 × 612.59
4. Step 4: Simplify right side
   1,109.94x = 938,316.35
5. Step 5: Solve for x
   x = 938,316.35/1,109.94
6. Step 6: Final answer
   x = 845.38