Finding the Fourth Proportional to 3,391.65, 5,077.89 and 2,156.00

Step by Step Solution

1. Step 1: Write the proportion equation
   3,391.65 : 5,077.89 = 2,156.00 : x
2. Step 2: Convert to fraction form
   3,391.65/5,077.89 = 2,156.00/x
3. Step 3: Cross multiply
   3,391.65x = 5,077.89 × 2,156.00
4. Step 4: Simplify right side
   3,391.65x = 10,947,905.45
5. Step 5: Solve for x
   x = 10,947,905.45/3,391.65
6. Step 6: Final answer
   x = 3,227.90