Finding the Fourth Proportional to 7,780.41, 10,724.27 and 5,418.45

Step by Step Solution

1. Step 1: Write the proportion equation
   7,780.41 : 10,724.27 = 5,418.45 : x
2. Step 2: Convert to fraction form
   7,780.41/10,724.27 = 5,418.45/x
3. Step 3: Cross multiply
   7,780.41x = 10,724.27 × 5,418.45
4. Step 4: Simplify right side
   7,780.41x = 58,108,893.69
5. Step 5: Solve for x
   x = 58,108,893.69/7,780.41
6. Step 6: Final answer
   x = 7,468.62