Finding the Fourth Proportional to 7,978.47, 11,009.82 and 4,621.05

Step by Step Solution

1. Step 1: Write the proportion equation
   7,978.47 : 11,009.82 = 4,621.05 : x
2. Step 2: Convert to fraction form
   7,978.47/11,009.82 = 4,621.05/x
3. Step 3: Cross multiply
   7,978.47x = 11,009.82 × 4,621.05
4. Step 4: Simplify right side
   7,978.47x = 50,876,928.71
5. Step 5: Solve for x
   x = 50,876,928.71/7,978.47
6. Step 6: Final answer
   x = 6,376.78