Finding the Fourth Proportional to 11,861.06, 16,370.52 and 7,820.78

Step by Step Solution

1. Step 1: Write the proportion equation
   11,861.06 : 16,370.52 = 7,820.78 : x
2. Step 2: Convert to fraction form
   11,861.06/16,370.52 = 7,820.78/x
3. Step 3: Cross multiply
   11,861.06x = 16,370.52 × 7,820.78
4. Step 4: Simplify right side
   11,861.06x = 128,030,235.41
5. Step 5: Solve for x
   x = 128,030,235.41/11,861.06
6. Step 6: Final answer
   x = 10,794.16