Finding the Fourth Proportional to 2,109.78, 3,160.65 and 1,012.62

Step by Step Solution

1. Step 1: Write the proportion equation
   2,109.78 : 3,160.65 = 1,012.62 : x
2. Step 2: Convert to fraction form
   2,109.78/3,160.65 = 1,012.62/x
3. Step 3: Cross multiply
   2,109.78x = 3,160.65 × 1,012.62
4. Step 4: Simplify right side
   2,109.78x = 3,200,537.40
5. Step 5: Solve for x
   x = 3,200,537.40/2,109.78
6. Step 6: Final answer
   x = 1,517.00