Finding the Fourth Proportional to 9,875.86, 13,628.55 and 5,399.60

Step by Step Solution

1. Step 1: Write the proportion equation
   9,875.86 : 13,628.55 = 5,399.60 : x
2. Step 2: Convert to fraction form
   9,875.86/13,628.55 = 5,399.60/x
3. Step 3: Cross multiply
   9,875.86x = 13,628.55 × 5,399.60
4. Step 4: Simplify right side
   9,875.86x = 73,588,670.69
5. Step 5: Solve for x
   x = 73,588,670.69/9,875.86
6. Step 6: Final answer
   x = 7,451.37