Finding the Fourth Proportional to 7,870.54, 10,864.29 and 5,218.84

Step by Step Solution

1. Step 1: Write the proportion equation
   7,870.54 : 10,864.29 = 5,218.84 : x
2. Step 2: Convert to fraction form
   7,870.54/10,864.29 = 5,218.84/x
3. Step 3: Cross multiply
   7,870.54x = 10,864.29 × 5,218.84
4. Step 4: Simplify right side
   7,870.54x = 56,698,991.22
5. Step 5: Solve for x
   x = 56,698,991.22/7,870.54
6. Step 6: Final answer
   x = 7,203.95