Finding the Fourth Proportional to 9,387.86, 12,956.83 and 5,411.28

Step by Step Solution

1. Step 1: Write the proportion equation
   9,387.86 : 12,956.83 = 5,411.28 : x
2. Step 2: Convert to fraction form
   9,387.86/12,956.83 = 5,411.28/x
3. Step 3: Cross multiply
   9,387.86x = 12,956.83 × 5,411.28
4. Step 4: Simplify right side
   9,387.86x = 70,112,997.22
5. Step 5: Solve for x
   x = 70,112,997.22/9,387.86
6. Step 6: Final answer
   x = 7,468.48