Finding the Fourth Proportional to 18,978.58, 28,467.78 and 6,498.69

Step by Step Solution

1. Step 1: Write the proportion equation
   18,978.58 : 28,467.78 = 6,498.69 : x
2. Step 2: Convert to fraction form
   18,978.58/28,467.78 = 6,498.69/x
3. Step 3: Cross multiply
   18,978.58x = 28,467.78 × 6,498.69
4. Step 4: Simplify right side
   18,978.58x = 185,003,277.21
5. Step 5: Solve for x
   x = 185,003,277.21/18,978.58
6. Step 6: Final answer
   x = 9,748.00