Finding the Fourth Proportional to 12,405.39, 17,111.76 and 8,156.94

Step by Step Solution

1. Step 1: Write the proportion equation
   12,405.39 : 17,111.76 = 8,156.94 : x
2. Step 2: Convert to fraction form
   12,405.39/17,111.76 = 8,156.94/x
3. Step 3: Cross multiply
   12,405.39x = 17,111.76 × 8,156.94
4. Step 4: Simplify right side
   12,405.39x = 139,579,599.61
5. Step 5: Solve for x
   x = 139,579,599.61/12,405.39
6. Step 6: Final answer
   x = 11,251.53