Finding the Fourth Proportional to 1,898.40, 2,618.82 and 1,112.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,898.40 : 2,618.82 = 1,112.31 : x
2. Step 2: Convert to fraction form
   1,898.40/2,618.82 = 1,112.31/x
3. Step 3: Cross multiply
   1,898.40x = 2,618.82 × 1,112.31
4. Step 4: Simplify right side
   1,898.40x = 2,912,939.67
5. Step 5: Solve for x
   x = 2,912,939.67/1,898.40
6. Step 6: Final answer
   x = 1,534.42