Finding the Fourth Proportional to 10,870.79, 16,293.59 and 5,015.21

Step by Step Solution

1. Step 1: Write the proportion equation
   10,870.79 : 16,293.59 = 5,015.21 : x
2. Step 2: Convert to fraction form
   10,870.79/16,293.59 = 5,015.21/x
3. Step 3: Cross multiply
   10,870.79x = 16,293.59 × 5,015.21
4. Step 4: Simplify right side
   10,870.79x = 81,715,750.43
5. Step 5: Solve for x
   x = 81,715,750.43/10,870.79
6. Step 6: Final answer
   x = 7,517.00