Finding the Fourth Proportional to 10,612.80, 15,884.55 and 7,315.92

Step by Step Solution

1. Step 1: Write the proportion equation
   10,612.80 : 15,884.55 = 7,315.92 : x
2. Step 2: Convert to fraction form
   10,612.80/15,884.55 = 7,315.92/x
3. Step 3: Cross multiply
   10,612.80x = 15,884.55 × 7,315.92
4. Step 4: Simplify right side
   10,612.80x = 116,210,097.04
5. Step 5: Solve for x
   x = 116,210,097.04/10,612.80
6. Step 6: Final answer
   x = 10,949.99