Finding the Fourth Proportional to 12,688.88, 19,028.28 and 4,892.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,688.88 : 19,028.28 = 4,892.72 : x
2. Step 2: Convert to fraction form
   12,688.88/19,028.28 = 4,892.72/x
3. Step 3: Cross multiply
   12,688.88x = 19,028.28 × 4,892.72
4. Step 4: Simplify right side
   12,688.88x = 93,100,046.12
5. Step 5: Solve for x
   x = 93,100,046.12/12,688.88
6. Step 6: Final answer
   x = 7,337.14