Finding the Fourth Proportional to 5,398.99, 8,103.98 and 5,188.86

Step by Step Solution

1. Step 1: Write the proportion equation
   5,398.99 : 8,103.98 = 5,188.86 : x
2. Step 2: Convert to fraction form
   5,398.99/8,103.98 = 5,188.86/x
3. Step 3: Cross multiply
   5,398.99x = 8,103.98 × 5,188.86
4. Step 4: Simplify right side
   5,398.99x = 42,050,430.63
5. Step 5: Solve for x
   x = 42,050,430.63/5,398.99
6. Step 6: Final answer
   x = 7,788.58