Finding the Fourth Proportional to 19,128.56, 28,694.50 and 5,277.56

Step by Step Solution

1. Step 1: Write the proportion equation
   19,128.56 : 28,694.50 = 5,277.56 : x
2. Step 2: Convert to fraction form
   19,128.56/28,694.50 = 5,277.56/x
3. Step 3: Cross multiply
   19,128.56x = 28,694.50 × 5,277.56
4. Step 4: Simplify right side
   19,128.56x = 151,437,003.96
5. Step 5: Solve for x
   x = 151,437,003.96/19,128.56
6. Step 6: Final answer
   x = 7,916.80