Finding the Fourth Proportional to 2,217.78, 3,058.70 and 1,377.81

Step by Step Solution

1. Step 1: Write the proportion equation
   2,217.78 : 3,058.70 = 1,377.81 : x
2. Step 2: Convert to fraction form
   2,217.78/3,058.70 = 1,377.81/x
3. Step 3: Cross multiply
   2,217.78x = 3,058.70 × 1,377.81
4. Step 4: Simplify right side
   2,217.78x = 4,214,300.56
5. Step 5: Solve for x
   x = 4,214,300.56/2,217.78
6. Step 6: Final answer
   x = 1,900.23