Finding the Fourth Proportional to 28,105.76, 42,160.88 and 7,329.44

Step by Step Solution

1. Step 1: Write the proportion equation
   28,105.76 : 42,160.88 = 7,329.44 : x
2. Step 2: Convert to fraction form
   28,105.76/42,160.88 = 7,329.44/x
3. Step 3: Cross multiply
   28,105.76x = 42,160.88 × 7,329.44
4. Step 4: Simplify right side
   28,105.76x = 309,015,640.31
5. Step 5: Solve for x
   x = 309,015,640.31/28,105.76
6. Step 6: Final answer
   x = 10,994.74