Finding the Fourth Proportional to 12,156.14, 18,236.73 and 5,136.17

Step by Step Solution

1. Step 1: Write the proportion equation
   12,156.14 : 18,236.73 = 5,136.17 : x
2. Step 2: Convert to fraction form
   12,156.14/18,236.73 = 5,136.17/x
3. Step 3: Cross multiply
   12,156.14x = 18,236.73 × 5,136.17
4. Step 4: Simplify right side
   12,156.14x = 93,666,854.34
5. Step 5: Solve for x
   x = 93,666,854.34/12,156.14
6. Step 6: Final answer
   x = 7,705.32