Finding the Fourth Proportional to 2,817.60, 3,885.72 and 2,153.22

Step by Step Solution

1. Step 1: Write the proportion equation
   2,817.60 : 3,885.72 = 2,153.22 : x
2. Step 2: Convert to fraction form
   2,817.60/3,885.72 = 2,153.22/x
3. Step 3: Cross multiply
   2,817.60x = 3,885.72 × 2,153.22
4. Step 4: Simplify right side
   2,817.60x = 8,366,810.02
5. Step 5: Solve for x
   x = 8,366,810.02/2,817.60
6. Step 6: Final answer
   x = 2,969.48