Finding the Fourth Proportional to 1,377.69, 2,055.83 and 1,215.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,377.69 : 2,055.83 = 1,215.69 : x
2. Step 2: Convert to fraction form
   1,377.69/2,055.83 = 1,215.69/x
3. Step 3: Cross multiply
   1,377.69x = 2,055.83 × 1,215.69
4. Step 4: Simplify right side
   1,377.69x = 2,499,245.89
5. Step 5: Solve for x
   x = 2,499,245.89/1,377.69
6. Step 6: Final answer
   x = 1,814.08