Finding the Fourth Proportional to 9,978.18, 14,962.28 and 3,402.06

Step by Step Solution

1. Step 1: Write the proportion equation
   9,978.18 : 14,962.28 = 3,402.06 : x
2. Step 2: Convert to fraction form
   9,978.18/14,962.28 = 3,402.06/x
3. Step 3: Cross multiply
   9,978.18x = 14,962.28 × 3,402.06
4. Step 4: Simplify right side
   9,978.18x = 50,902,574.30
5. Step 5: Solve for x
   x = 50,902,574.30/9,978.18
6. Step 6: Final answer
   x = 5,101.39