Finding the Fourth Proportional to 12,998.86, 17,930.73 and 7,965.34

Step by Step Solution

1. Step 1: Write the proportion equation
   12,998.86 : 17,930.73 = 7,965.34 : x
2. Step 2: Convert to fraction form
   12,998.86/17,930.73 = 7,965.34/x
3. Step 3: Cross multiply
   12,998.86x = 17,930.73 × 7,965.34
4. Step 4: Simplify right side
   12,998.86x = 142,824,360.90
5. Step 5: Solve for x
   x = 142,824,360.90/12,998.86
6. Step 6: Final answer
   x = 10,987.45