Finding the Fourth Proportional to 2,385.54, 3,291.39 and 1,377.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,385.54 : 3,291.39 = 1,377.21 : x
2. Step 2: Convert to fraction form
   2,385.54/3,291.39 = 1,377.21/x
3. Step 3: Cross multiply
   2,385.54x = 3,291.39 × 1,377.21
4. Step 4: Simplify right side
   2,385.54x = 4,532,935.22
5. Step 5: Solve for x
   x = 4,532,935.22/2,385.54
6. Step 6: Final answer
   x = 1,900.17