Finding the Fourth Proportional to 2,101.39, 2,900.15 and 1,315.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,101.39 : 2,900.15 = 1,315.69 : x
2. Step 2: Convert to fraction form
   2,101.39/2,900.15 = 1,315.69/x
3. Step 3: Cross multiply
   2,101.39x = 2,900.15 × 1,315.69
4. Step 4: Simplify right side
   2,101.39x = 3,815,698.35
5. Step 5: Solve for x
   x = 3,815,698.35/2,101.39
6. Step 6: Final answer
   x = 1,815.80