Finding the Fourth Proportional to 19,321.82, 28,978.07 and 5,281.91

Step by Step Solution

1. Step 1: Write the proportion equation
   19,321.82 : 28,978.07 = 5,281.91 : x
2. Step 2: Convert to fraction form
   19,321.82/28,978.07 = 5,281.91/x
3. Step 3: Cross multiply
   19,321.82x = 28,978.07 × 5,281.91
4. Step 4: Simplify right side
   19,321.82x = 153,059,386.41
5. Step 5: Solve for x
   x = 153,059,386.41/19,321.82
6. Step 6: Final answer
   x = 7,921.58