Finding the Fourth Proportional to 12,315.63, 16,996.59 and 10,071.21

Step by Step Solution

1. Step 1: Write the proportion equation
   12,315.63 : 16,996.59 = 10,071.21 : x
2. Step 2: Convert to fraction form
   12,315.63/16,996.59 = 10,071.21/x
3. Step 3: Cross multiply
   12,315.63x = 16,996.59 × 10,071.21
4. Step 4: Simplify right side
   12,315.63x = 171,176,227.17
5. Step 5: Solve for x
   x = 171,176,227.17/12,315.63
6. Step 6: Final answer
   x = 13,899.10