Finding the Fourth Proportional to 2,810.07, 3,875.40 and 2,145.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,810.07 : 3,875.40 = 2,145.69 : x
2. Step 2: Convert to fraction form
   2,810.07/3,875.40 = 2,145.69/x
3. Step 3: Cross multiply
   2,810.07x = 3,875.40 × 2,145.69
4. Step 4: Simplify right side
   2,810.07x = 8,315,407.03
5. Step 5: Solve for x
   x = 8,315,407.03/2,810.07
6. Step 6: Final answer
   x = 2,959.15