Finding the Fourth Proportional to 3,870.53, 5,796.57 and 2,112.90

Step by Step Solution

1. Step 1: Write the proportion equation
   3,870.53 : 5,796.57 = 2,112.90 : x
2. Step 2: Convert to fraction form
   3,870.53/5,796.57 = 2,112.90/x
3. Step 3: Cross multiply
   3,870.53x = 5,796.57 × 2,112.90
4. Step 4: Simplify right side
   3,870.53x = 12,247,572.75
5. Step 5: Solve for x
   x = 12,247,572.75/3,870.53
6. Step 6: Final answer
   x = 3,164.31