Finding the Fourth Proportional to 2,100.75, 2,899.04 and 1,216.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,100.75 : 2,899.04 = 1,216.61 : x
2. Step 2: Convert to fraction form
   2,100.75/2,899.04 = 1,216.61/x
3. Step 3: Cross multiply
   2,100.75x = 2,899.04 × 1,216.61
4. Step 4: Simplify right side
   2,100.75x = 3,526,980.48
5. Step 5: Solve for x
   x = 3,526,980.48/2,100.75
6. Step 6: Final answer
   x = 1,678.91