Finding the Fourth Proportional to 8,978.28, 12,388.59 and 4,998.48

Step by Step Solution

1. Step 1: Write the proportion equation
   8,978.28 : 12,388.59 = 4,998.48 : x
2. Step 2: Convert to fraction form
   8,978.28/12,388.59 = 4,998.48/x
3. Step 3: Cross multiply
   8,978.28x = 12,388.59 × 4,998.48
4. Step 4: Simplify right side
   8,978.28x = 61,924,119.34
5. Step 5: Solve for x
   x = 61,924,119.34/8,978.28
6. Step 6: Final answer
   x = 6,897.10