Finding the Fourth Proportional to 10,978.94, 16,430.11 and 8,981.48

Step by Step Solution

1. Step 1: Write the proportion equation
   10,978.94 : 16,430.11 = 8,981.48 : x
2. Step 2: Convert to fraction form
   10,978.94/16,430.11 = 8,981.48/x
3. Step 3: Cross multiply
   10,978.94x = 16,430.11 × 8,981.48
4. Step 4: Simplify right side
   10,978.94x = 147,566,722.98
5. Step 5: Solve for x
   x = 147,566,722.98/10,978.94
6. Step 6: Final answer
   x = 13,440.89