Finding the Fourth Proportional to 13,008.78, 17,948.03 and 7,970.49

Step by Step Solution

1. Step 1: Write the proportion equation
   13,008.78 : 17,948.03 = 7,970.49 : x
2. Step 2: Convert to fraction form
   13,008.78/17,948.03 = 7,970.49/x
3. Step 3: Cross multiply
   13,008.78x = 17,948.03 × 7,970.49
4. Step 4: Simplify right side
   13,008.78x = 143,054,553.78
5. Step 5: Solve for x
   x = 143,054,553.78/13,008.78
6. Step 6: Final answer
   x = 10,996.77