Finding the Fourth Proportional to 3,345.40, 5,019.60 and 1,155.70

Step by Step Solution

1. Step 1: Write the proportion equation
   3,345.40 : 5,019.60 = 1,155.70 : x
2. Step 2: Convert to fraction form
   3,345.40/5,019.60 = 1,155.70/x
3. Step 3: Cross multiply
   3,345.40x = 5,019.60 × 1,155.70
4. Step 4: Simplify right side
   3,345.40x = 5,801,151.72
5. Step 5: Solve for x
   x = 5,801,151.72/3,345.40
6. Step 6: Final answer
   x = 1,734.07