Finding the Fourth Proportional to 11,298.43, 15,574.55 and 7,931.80

Step by Step Solution

1. Step 1: Write the proportion equation
   11,298.43 : 15,574.55 = 7,931.80 : x
2. Step 2: Convert to fraction form
   11,298.43/15,574.55 = 7,931.80/x
3. Step 3: Cross multiply
   11,298.43x = 15,574.55 × 7,931.80
4. Step 4: Simplify right side
   11,298.43x = 123,534,215.69
5. Step 5: Solve for x
   x = 123,534,215.69/11,298.43
6. Step 6: Final answer
   x = 10,933.75