Finding the Fourth Proportional to 12,779.91, 17,630.55 and 7,472.43

Step by Step Solution

1. Step 1: Write the proportion equation
   12,779.91 : 17,630.55 = 7,472.43 : x
2. Step 2: Convert to fraction form
   12,779.91/17,630.55 = 7,472.43/x
3. Step 3: Cross multiply
   12,779.91x = 17,630.55 × 7,472.43
4. Step 4: Simplify right side
   12,779.91x = 131,743,050.74
5. Step 5: Solve for x
   x = 131,743,050.74/12,779.91
6. Step 6: Final answer
   x = 10,308.61