Finding the Fourth Proportional to 2,100.99, 2,899.15 and 1,216.63

Step by Step Solution

1. Step 1: Write the proportion equation
   2,100.99 : 2,899.15 = 1,216.63 : x
2. Step 2: Convert to fraction form
   2,100.99/2,899.15 = 1,216.63/x
3. Step 3: Cross multiply
   2,100.99x = 2,899.15 × 1,216.63
4. Step 4: Simplify right side
   2,100.99x = 3,527,182.58
5. Step 5: Solve for x
   x = 3,527,182.58/2,100.99
6. Step 6: Final answer
   x = 1,678.82