Finding the Fourth Proportional to 7,870.46, 10,857.73 and 5,317.40

Step by Step Solution

1. Step 1: Write the proportion equation
   7,870.46 : 10,857.73 = 5,317.40 : x
2. Step 2: Convert to fraction form
   7,870.46/10,857.73 = 5,317.40/x
3. Step 3: Cross multiply
   7,870.46x = 10,857.73 × 5,317.40
4. Step 4: Simplify right side
   7,870.46x = 57,734,917.32
5. Step 5: Solve for x
   x = 57,734,917.32/7,870.46
6. Step 6: Final answer
   x = 7,335.64