Finding the Fourth Proportional to 2,085.72, 3,130 and 1,112.52

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.72 : 3,130 = 1,112.52 : x
2. Step 2: Convert to fraction form
   2,085.72/3,130 = 1,112.52/x
3. Step 3: Cross multiply
   2,085.72x = 3,130 × 1,112.52
4. Step 4: Simplify right side
   2,085.72x = 3,482,187.60
5. Step 5: Solve for x
   x = 3,482,187.60/2,085.72
6. Step 6: Final answer
   x = 1,669.54