Finding the Fourth Proportional to 19,128.96, 28,695.60 and 5,978.88

Step by Step Solution

1. Step 1: Write the proportion equation
   19,128.96 : 28,695.60 = 5,978.88 : x
2. Step 2: Convert to fraction form
   19,128.96/28,695.60 = 5,978.88/x
3. Step 3: Cross multiply
   19,128.96x = 28,695.60 × 5,978.88
4. Step 4: Simplify right side
   19,128.96x = 171,567,548.93
5. Step 5: Solve for x
   x = 171,567,548.93/19,128.96
6. Step 6: Final answer
   x = 8,969.00