Finding the Fourth Proportional to 8,722.89, 13,085.55 and 2,878.88

Step by Step Solution

1. Step 1: Write the proportion equation
   8,722.89 : 13,085.55 = 2,878.88 : x
2. Step 2: Convert to fraction form
   8,722.89/13,085.55 = 2,878.88/x
3. Step 3: Cross multiply
   8,722.89x = 13,085.55 × 2,878.88
4. Step 4: Simplify right side
   8,722.89x = 37,671,662.76
5. Step 5: Solve for x
   x = 37,671,662.76/8,722.89
6. Step 6: Final answer
   x = 4,318.71