Finding the Fourth Proportional to 2,100.96, 2,899.68 and 1,216.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,100.96 : 2,899.68 = 1,216.80 : x
2. Step 2: Convert to fraction form
   2,100.96/2,899.68 = 1,216.80/x
3. Step 3: Cross multiply
   2,100.96x = 2,899.68 × 1,216.80
4. Step 4: Simplify right side
   2,100.96x = 3,528,330.62
5. Step 5: Solve for x
   x = 3,528,330.62/2,100.96
6. Step 6: Final answer
   x = 1,679.39