Finding the Fourth Proportional to 2,213.86, 3,055.15 and 1,219.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,213.86 : 3,055.15 = 1,219.12 : x
2. Step 2: Convert to fraction form
   2,213.86/3,055.15 = 1,219.12/x
3. Step 3: Cross multiply
   2,213.86x = 3,055.15 × 1,219.12
4. Step 4: Simplify right side
   2,213.86x = 3,724,594.47
5. Step 5: Solve for x
   x = 3,724,594.47/2,213.86
6. Step 6: Final answer
   x = 1,682.40