Finding the Fourth Proportional to 12,586.53, 18,863.65 and 5,196.18

Step by Step Solution

1. Step 1: Write the proportion equation
   12,586.53 : 18,863.65 = 5,196.18 : x
2. Step 2: Convert to fraction form
   12,586.53/18,863.65 = 5,196.18/x
3. Step 3: Cross multiply
   12,586.53x = 18,863.65 × 5,196.18
4. Step 4: Simplify right side
   12,586.53x = 98,018,920.86
5. Step 5: Solve for x
   x = 98,018,920.86/12,586.53
6. Step 6: Final answer
   x = 7,787.60