Finding the Fourth Proportional to 12,680.40, 17,498.70 and 7,897.94

Step by Step Solution

1. Step 1: Write the proportion equation
   12,680.40 : 17,498.70 = 7,897.94 : x
2. Step 2: Convert to fraction form
   12,680.40/17,498.70 = 7,897.94/x
3. Step 3: Cross multiply
   12,680.40x = 17,498.70 × 7,897.94
4. Step 4: Simplify right side
   12,680.40x = 138,203,595.18
5. Step 5: Solve for x
   x = 138,203,595.18/12,680.40
6. Step 6: Final answer
   x = 10,898.99