Finding the Fourth Proportional to 12,459, 17,196.64 and 7,156.74

Step by Step Solution

1. Step 1: Write the proportion equation
   12,459 : 17,196.64 = 7,156.74 : x
2. Step 2: Convert to fraction form
   12,459/17,196.64 = 7,156.74/x
3. Step 3: Cross multiply
   12,459x = 17,196.64 × 7,156.74
4. Step 4: Simplify right side
   12,459x = 123,071,881.35
5. Step 5: Solve for x
   x = 123,071,881.35/12,459
6. Step 6: Final answer
   x = 9,878.15