Finding the Fourth Proportional to 1,377.09, 2,055.56 and 1,213.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,377.09 : 2,055.56 = 1,213.07 : x
2. Step 2: Convert to fraction form
   1,377.09/2,055.56 = 1,213.07/x
3. Step 3: Cross multiply
   1,377.09x = 2,055.56 × 1,213.07
4. Step 4: Simplify right side
   1,377.09x = 2,493,521.83
5. Step 5: Solve for x
   x = 2,493,521.83/1,377.09
6. Step 6: Final answer
   x = 1,810.72