Finding the Fourth Proportional to 8,320.86, 12,483.15 and 3,126.78

Step by Step Solution

1. Step 1: Write the proportion equation
   8,320.86 : 12,483.15 = 3,126.78 : x
2. Step 2: Convert to fraction form
   8,320.86/12,483.15 = 3,126.78/x
3. Step 3: Cross multiply
   8,320.86x = 12,483.15 × 3,126.78
4. Step 4: Simplify right side
   8,320.86x = 39,032,063.76
5. Step 5: Solve for x
   x = 39,032,063.76/8,320.86
6. Step 6: Final answer
   x = 4,690.87