Finding the Fourth Proportional to 13,320.30, 19,978.56 and 4,553.94

Step by Step Solution

1. Step 1: Write the proportion equation
   13,320.30 : 19,978.56 = 4,553.94 : x
2. Step 2: Convert to fraction form
   13,320.30/19,978.56 = 4,553.94/x
3. Step 3: Cross multiply
   13,320.30x = 19,978.56 × 4,553.94
4. Step 4: Simplify right side
   13,320.30x = 90,981,163.53
5. Step 5: Solve for x
   x = 90,981,163.53/13,320.30
6. Step 6: Final answer
   x = 6,830.26