Finding the Fourth Proportional to 3,111.57, 4,667.45 and 1,380.19

Step by Step Solution

1. Step 1: Write the proportion equation
   3,111.57 : 4,667.45 = 1,380.19 : x
2. Step 2: Convert to fraction form
   3,111.57/4,667.45 = 1,380.19/x
3. Step 3: Cross multiply
   3,111.57x = 4,667.45 × 1,380.19
4. Step 4: Simplify right side
   3,111.57x = 6,441,967.82
5. Step 5: Solve for x
   x = 6,441,967.82/3,111.57
6. Step 6: Final answer
   x = 2,070.33