Finding the Fourth Proportional to 3,910.63, 5,866.83 and 1,313.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,910.63 : 5,866.83 = 1,313.50 : x
2. Step 2: Convert to fraction form
   3,910.63/5,866.83 = 1,313.50/x
3. Step 3: Cross multiply
   3,910.63x = 5,866.83 × 1,313.50
4. Step 4: Simplify right side
   3,910.63x = 7,706,081.21
5. Step 5: Solve for x
   x = 7,706,081.21/3,910.63
6. Step 6: Final answer
   x = 1,970.55