Finding the Fourth Proportional to 3,978.18, 5,962.14 and 2,223.11

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.18 : 5,962.14 = 2,223.11 : x
2. Step 2: Convert to fraction form
   3,978.18/5,962.14 = 2,223.11/x
3. Step 3: Cross multiply
   3,978.18x = 5,962.14 × 2,223.11
4. Step 4: Simplify right side
   3,978.18x = 13,254,507.96
5. Step 5: Solve for x
   x = 13,254,507.96/3,978.18
6. Step 6: Final answer
   x = 3,331.80