Finding the Fourth Proportional to 3,913.17, 5,870.43 and 1,315.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,913.17 : 5,870.43 = 1,315.50 : x
2. Step 2: Convert to fraction form
   3,913.17/5,870.43 = 1,315.50/x
3. Step 3: Cross multiply
   3,913.17x = 5,870.43 × 1,315.50
4. Step 4: Simplify right side
   3,913.17x = 7,722,550.67
5. Step 5: Solve for x
   x = 7,722,550.67/3,913.17
6. Step 6: Final answer
   x = 1,973.48