Finding the Fourth Proportional to 8,641.86, 11,927.55 and 5,620.76

Step by Step Solution

1. Step 1: Write the proportion equation
   8,641.86 : 11,927.55 = 5,620.76 : x
2. Step 2: Convert to fraction form
   8,641.86/11,927.55 = 5,620.76/x
3. Step 3: Cross multiply
   8,641.86x = 11,927.55 × 5,620.76
4. Step 4: Simplify right side
   8,641.86x = 67,041,836.30
5. Step 5: Solve for x
   x = 67,041,836.30/8,641.86
6. Step 6: Final answer
   x = 7,757.80