Finding the Fourth Proportional to 15,978.58, 22,051.11 and 8,905

Step by Step Solution

1. Step 1: Write the proportion equation
   15,978.58 : 22,051.11 = 8,905 : x
2. Step 2: Convert to fraction form
   15,978.58/22,051.11 = 8,905/x
3. Step 3: Cross multiply
   15,978.58x = 22,051.11 × 8,905
4. Step 4: Simplify right side
   15,978.58x = 196,365,134.55
5. Step 5: Solve for x
   x = 196,365,134.55/15,978.58
6. Step 6: Final answer
   x = 12,289.27