Finding the Fourth Proportional to 9,998.72, 14,995.77 and 2,978.09

Step by Step Solution

1. Step 1: Write the proportion equation
   9,998.72 : 14,995.77 = 2,978.09 : x
2. Step 2: Convert to fraction form
   9,998.72/14,995.77 = 2,978.09/x
3. Step 3: Cross multiply
   9,998.72x = 14,995.77 × 2,978.09
4. Step 4: Simplify right side
   9,998.72x = 44,658,823.87
5. Step 5: Solve for x
   x = 44,658,823.87/9,998.72
6. Step 6: Final answer
   x = 4,466.45