Finding the Fourth Proportional to 7,870.29, 10,863.95 and 5,218.59

Step by Step Solution

1. Step 1: Write the proportion equation
   7,870.29 : 10,863.95 = 5,218.59 : x
2. Step 2: Convert to fraction form
   7,870.29/10,863.95 = 5,218.59/x
3. Step 3: Cross multiply
   7,870.29x = 10,863.95 × 5,218.59
4. Step 4: Simplify right side
   7,870.29x = 56,694,474.74
5. Step 5: Solve for x
   x = 56,694,474.74/7,870.29
6. Step 6: Final answer
   x = 7,203.61