Finding the Fourth Proportional to 2,154.62, 2,971.55 and 1,820.17

Step by Step Solution

1. Step 1: Write the proportion equation
   2,154.62 : 2,971.55 = 1,820.17 : x
2. Step 2: Convert to fraction form
   2,154.62/2,971.55 = 1,820.17/x
3. Step 3: Cross multiply
   2,154.62x = 2,971.55 × 1,820.17
4. Step 4: Simplify right side
   2,154.62x = 5,408,711.31
5. Step 5: Solve for x
   x = 5,408,711.31/2,154.62
6. Step 6: Final answer
   x = 2,510.29