Finding the Fourth Proportional to 10,380.76, 15,585.72 and 5,318.58

Step by Step Solution

1. Step 1: Write the proportion equation
   10,380.76 : 15,585.72 = 5,318.58 : x
2. Step 2: Convert to fraction form
   10,380.76/15,585.72 = 5,318.58/x
3. Step 3: Cross multiply
   10,380.76x = 15,585.72 × 5,318.58
4. Step 4: Simplify right side
   10,380.76x = 82,893,898.68
5. Step 5: Solve for x
   x = 82,893,898.68/10,380.76
6. Step 6: Final answer
   x = 7,985.34