Finding the Fourth Proportional to 2,101.59, 2,900.59 and 1,205.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,101.59 : 2,900.59 = 1,205.86 : x
2. Step 2: Convert to fraction form
   2,101.59/2,900.59 = 1,205.86/x
3. Step 3: Cross multiply
   2,101.59x = 2,900.59 × 1,205.86
4. Step 4: Simplify right side
   2,101.59x = 3,497,690.95
5. Step 5: Solve for x
   x = 3,497,690.95/2,101.59
6. Step 6: Final answer
   x = 1,664.31