Finding the Fourth Proportional to 12,961.72, 19,442.55 and 5,176

Step by Step Solution

1. Step 1: Write the proportion equation
   12,961.72 : 19,442.55 = 5,176 : x
2. Step 2: Convert to fraction form
   12,961.72/19,442.55 = 5,176/x
3. Step 3: Cross multiply
   12,961.72x = 19,442.55 × 5,176
4. Step 4: Simplify right side
   12,961.72x = 100,634,638.80
5. Step 5: Solve for x
   x = 100,634,638.80/12,961.72
6. Step 6: Final answer
   x = 7,763.99