Finding the Fourth Proportional to 2,671.35, 3,687.69 and 1,905.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,671.35 : 3,687.69 = 1,905.30 : x
2. Step 2: Convert to fraction form
   2,671.35/3,687.69 = 1,905.30/x
3. Step 3: Cross multiply
   2,671.35x = 3,687.69 × 1,905.30
4. Step 4: Simplify right side
   2,671.35x = 7,026,155.76
5. Step 5: Solve for x
   x = 7,026,155.76/2,671.35
6. Step 6: Final answer
   x = 2,630.19