Finding the Fourth Proportional to 6,870.30, 10,307.79 and 2,921.39

Step by Step Solution

1. Step 1: Write the proportion equation
   6,870.30 : 10,307.79 = 2,921.39 : x
2. Step 2: Convert to fraction form
   6,870.30/10,307.79 = 2,921.39/x
3. Step 3: Cross multiply
   6,870.30x = 10,307.79 × 2,921.39
4. Step 4: Simplify right side
   6,870.30x = 30,113,074.63
5. Step 5: Solve for x
   x = 30,113,074.63/6,870.30
6. Step 6: Final answer
   x = 4,383.08