Finding the Fourth Proportional to 20,156.10, 30,212.55 and 7,671.30

Step by Step Solution

1. Step 1: Write the proportion equation
   20,156.10 : 30,212.55 = 7,671.30 : x
2. Step 2: Convert to fraction form
   20,156.10/30,212.55 = 7,671.30/x
3. Step 3: Cross multiply
   20,156.10x = 30,212.55 × 7,671.30
4. Step 4: Simplify right side
   20,156.10x = 231,769,534.82
5. Step 5: Solve for x
   x = 231,769,534.82/20,156.10
6. Step 6: Final answer
   x = 11,498.73