Finding the Fourth Proportional to 2,100.91, 2,899.40 and 1,217.02

Step by Step Solution

1. Step 1: Write the proportion equation
   2,100.91 : 2,899.40 = 1,217.02 : x
2. Step 2: Convert to fraction form
   2,100.91/2,899.40 = 1,217.02/x
3. Step 3: Cross multiply
   2,100.91x = 2,899.40 × 1,217.02
4. Step 4: Simplify right side
   2,100.91x = 3,528,627.79
5. Step 5: Solve for x
   x = 3,528,627.79/2,100.91
6. Step 6: Final answer
   x = 1,679.57