Finding the Fourth Proportional to 2,090.61, 2,885.12 and 1,206.19

Step by Step Solution

1. Step 1: Write the proportion equation
   2,090.61 : 2,885.12 = 1,206.19 : x
2. Step 2: Convert to fraction form
   2,090.61/2,885.12 = 1,206.19/x
3. Step 3: Cross multiply
   2,090.61x = 2,885.12 × 1,206.19
4. Step 4: Simplify right side
   2,090.61x = 3,480,002.89
5. Step 5: Solve for x
   x = 3,480,002.89/2,090.61
6. Step 6: Final answer
   x = 1,664.59