Finding the Fourth Proportional to 10,581.74, 15,870.60 and 5,315.34

Step by Step Solution

1. Step 1: Write the proportion equation
   10,581.74 : 15,870.60 = 5,315.34 : x
2. Step 2: Convert to fraction form
   10,581.74/15,870.60 = 5,315.34/x
3. Step 3: Cross multiply
   10,581.74x = 15,870.60 × 5,315.34
4. Step 4: Simplify right side
   10,581.74x = 84,357,635.00
5. Step 5: Solve for x
   x = 84,357,635.00/10,581.74
6. Step 6: Final answer
   x = 7,972.00