Finding the Fourth Proportional to 5,222.18, 7,206.72 and 3,178.06

Step by Step Solution

1. Step 1: Write the proportion equation
   5,222.18 : 7,206.72 = 3,178.06 : x
2. Step 2: Convert to fraction form
   5,222.18/7,206.72 = 3,178.06/x
3. Step 3: Cross multiply
   5,222.18x = 7,206.72 × 3,178.06
4. Step 4: Simplify right side
   5,222.18x = 22,903,388.56
5. Step 5: Solve for x
   x = 22,903,388.56/5,222.18
6. Step 6: Final answer
   x = 4,385.79