Finding the Fourth Proportional to 9,354.98, 12,910.11 and 5,578.88

Step by Step Solution

1. Step 1: Write the proportion equation
   9,354.98 : 12,910.11 = 5,578.88 : x
2. Step 2: Convert to fraction form
   9,354.98/12,910.11 = 5,578.88/x
3. Step 3: Cross multiply
   9,354.98x = 12,910.11 × 5,578.88
4. Step 4: Simplify right side
   9,354.98x = 72,023,986.75
5. Step 5: Solve for x
   x = 72,023,986.75/9,354.98
6. Step 6: Final answer
   x = 7,699.00