Finding the Fourth Proportional to 12,709.48, 19,061.90 and 5,311.96

Step by Step Solution

1. Step 1: Write the proportion equation
   12,709.48 : 19,061.90 = 5,311.96 : x
2. Step 2: Convert to fraction form
   12,709.48/19,061.90 = 5,311.96/x
3. Step 3: Cross multiply
   12,709.48x = 19,061.90 × 5,311.96
4. Step 4: Simplify right side
   12,709.48x = 101,256,050.32
5. Step 5: Solve for x
   x = 101,256,050.32/12,709.48
6. Step 6: Final answer
   x = 7,966.97