Finding the Fourth Proportional to 3,910.43, 5,866.25 and 1,312.76

Step by Step Solution

1. Step 1: Write the proportion equation
   3,910.43 : 5,866.25 = 1,312.76 : x
2. Step 2: Convert to fraction form
   3,910.43/5,866.25 = 1,312.76/x
3. Step 3: Cross multiply
   3,910.43x = 5,866.25 × 1,312.76
4. Step 4: Simplify right side
   3,910.43x = 7,700,978.35
5. Step 5: Solve for x
   x = 7,700,978.35/3,910.43
6. Step 6: Final answer
   x = 1,969.34