Finding the Fourth Proportional to 13,938.72, 19,234.16 and 7,970.20

Step by Step Solution

1. Step 1: Write the proportion equation
   13,938.72 : 19,234.16 = 7,970.20 : x
2. Step 2: Convert to fraction form
   13,938.72/19,234.16 = 7,970.20/x
3. Step 3: Cross multiply
   13,938.72x = 19,234.16 × 7,970.20
4. Step 4: Simplify right side
   13,938.72x = 153,300,102.03
5. Step 5: Solve for x
   x = 153,300,102.03/13,938.72
6. Step 6: Final answer
   x = 10,998.15