Finding the Fourth Proportional to 10,357.80, 15,519.42 and 7,274.28

Step by Step Solution

1. Step 1: Write the proportion equation
   10,357.80 : 15,519.42 = 7,274.28 : x
2. Step 2: Convert to fraction form
   10,357.80/15,519.42 = 7,274.28/x
3. Step 3: Cross multiply
   10,357.80x = 15,519.42 × 7,274.28
4. Step 4: Simplify right side
   10,357.80x = 112,892,606.52
5. Step 5: Solve for x
   x = 112,892,606.52/10,357.80
6. Step 6: Final answer
   x = 10,899.28