Finding the Fourth Proportional to 2,645.76, 3,969.30 and 1,002.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,645.76 : 3,969.30 = 1,002.31 : x
2. Step 2: Convert to fraction form
   2,645.76/3,969.30 = 1,002.31/x
3. Step 3: Cross multiply
   2,645.76x = 3,969.30 × 1,002.31
4. Step 4: Simplify right side
   2,645.76x = 3,978,462.92
5. Step 5: Solve for x
   x = 3,978,462.92/2,645.76
6. Step 6: Final answer
   x = 1,503.71