Finding the Fourth Proportional to 9,354.30, 12,911.15 and 5,377.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,354.30 : 12,911.15 = 5,377.72 : x
2. Step 2: Convert to fraction form
   9,354.30/12,911.15 = 5,377.72/x
3. Step 3: Cross multiply
   9,354.30x = 12,911.15 × 5,377.72
4. Step 4: Simplify right side
   9,354.30x = 69,432,604.72
5. Step 5: Solve for x
   x = 69,432,604.72/9,354.30
6. Step 6: Final answer
   x = 7,422.53