Finding the Fourth Proportional to 10,917.60, 16,380.72 and 7,219.04

Step by Step Solution

1. Step 1: Write the proportion equation
   10,917.60 : 16,380.72 = 7,219.04 : x
2. Step 2: Convert to fraction form
   10,917.60/16,380.72 = 7,219.04/x
3. Step 3: Cross multiply
   10,917.60x = 16,380.72 × 7,219.04
4. Step 4: Simplify right side
   10,917.60x = 118,253,072.91
5. Step 5: Solve for x
   x = 118,253,072.91/10,917.60
6. Step 6: Final answer
   x = 10,831.42