Finding the Fourth Proportional to 2,153.12, 2,971.41 and 1,686.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,153.12 : 2,971.41 = 1,686.56 : x
2. Step 2: Convert to fraction form
   2,153.12/2,971.41 = 1,686.56/x
3. Step 3: Cross multiply
   2,153.12x = 2,971.41 × 1,686.56
4. Step 4: Simplify right side
   2,153.12x = 5,011,461.25
5. Step 5: Solve for x
   x = 5,011,461.25/2,153.12
6. Step 6: Final answer
   x = 2,327.53