Finding the Fourth Proportional to 3,870.63, 5,798.27 and 1,787.76

Step by Step Solution

1. Step 1: Write the proportion equation
   3,870.63 : 5,798.27 = 1,787.76 : x
2. Step 2: Convert to fraction form
   3,870.63/5,798.27 = 1,787.76/x
3. Step 3: Cross multiply
   3,870.63x = 5,798.27 × 1,787.76
4. Step 4: Simplify right side
   3,870.63x = 10,365,919.64
5. Step 5: Solve for x
   x = 10,365,919.64/3,870.63
6. Step 6: Final answer
   x = 2,678.10