Finding the Fourth Proportional to 2,645.25, 3,969.17 and 1,870.23

Step by Step Solution

1. Step 1: Write the proportion equation
   2,645.25 : 3,969.17 = 1,870.23 : x
2. Step 2: Convert to fraction form
   2,645.25/3,969.17 = 1,870.23/x
3. Step 3: Cross multiply
   2,645.25x = 3,969.17 × 1,870.23
4. Step 4: Simplify right side
   2,645.25x = 7,423,260.81
5. Step 5: Solve for x
   x = 7,423,260.81/2,645.25
6. Step 6: Final answer
   x = 2,806.26