Finding the Fourth Proportional to 3,880.90, 5,355.72 and 2,112.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,880.90 : 5,355.72 = 2,112.50 : x
2. Step 2: Convert to fraction form
   3,880.90/5,355.72 = 2,112.50/x
3. Step 3: Cross multiply
   3,880.90x = 5,355.72 × 2,112.50
4. Step 4: Simplify right side
   3,880.90x = 11,313,958.50
5. Step 5: Solve for x
   x = 11,313,958.50/3,880.90
6. Step 6: Final answer
   x = 2,915.29