Finding the Fourth Proportional to 19,141.68, 28,709.28 and 5,290.72

Step by Step Solution

1. Step 1: Write the proportion equation
   19,141.68 : 28,709.28 = 5,290.72 : x
2. Step 2: Convert to fraction form
   19,141.68/28,709.28 = 5,290.72/x
3. Step 3: Cross multiply
   19,141.68x = 28,709.28 × 5,290.72
4. Step 4: Simplify right side
   19,141.68x = 151,892,761.88
5. Step 5: Solve for x
   x = 151,892,761.88/19,141.68
6. Step 6: Final answer
   x = 7,935.18