Finding the Fourth Proportional to 19,018.47, 28,529.34 and 4,978.44

Step by Step Solution

1. Step 1: Write the proportion equation
   19,018.47 : 28,529.34 = 4,978.44 : x
2. Step 2: Convert to fraction form
   19,018.47/28,529.34 = 4,978.44/x
3. Step 3: Cross multiply
   19,018.47x = 28,529.34 × 4,978.44
4. Step 4: Simplify right side
   19,018.47x = 142,031,607.43
5. Step 5: Solve for x
   x = 142,031,607.43/19,018.47
6. Step 6: Final answer
   x = 7,468.09