Finding the Fourth Proportional to 10,067.60, 13,892.90 and 5,591.28

Step by Step Solution

1. Step 1: Write the proportion equation
   10,067.60 : 13,892.90 = 5,591.28 : x
2. Step 2: Convert to fraction form
   10,067.60/13,892.90 = 5,591.28/x
3. Step 3: Cross multiply
   10,067.60x = 13,892.90 × 5,591.28
4. Step 4: Simplify right side
   10,067.60x = 77,679,093.91
5. Step 5: Solve for x
   x = 77,679,093.91/10,067.60
6. Step 6: Final answer
   x = 7,715.75