Finding the Fourth Proportional to 1,889.86, 2,834.84 and 1,115.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,889.86 : 2,834.84 = 1,115.31 : x
2. Step 2: Convert to fraction form
   1,889.86/2,834.84 = 1,115.31/x
3. Step 3: Cross multiply
   1,889.86x = 2,834.84 × 1,115.31
4. Step 4: Simplify right side
   1,889.86x = 3,161,725.40
5. Step 5: Solve for x
   x = 3,161,725.40/1,889.86
6. Step 6: Final answer
   x = 1,672.99