Finding the Fourth Proportional to 2,069.80, 3,105.15 and 1,146.70

Step by Step Solution

1. Step 1: Write the proportion equation
   2,069.80 : 3,105.15 = 1,146.70 : x
2. Step 2: Convert to fraction form
   2,069.80/3,105.15 = 1,146.70/x
3. Step 3: Cross multiply
   2,069.80x = 3,105.15 × 1,146.70
4. Step 4: Simplify right side
   2,069.80x = 3,560,675.51
5. Step 5: Solve for x
   x = 3,560,675.51/2,069.80
6. Step 6: Final answer
   x = 1,720.30