Finding the Fourth Proportional to 13,011.26, 17,955.86 and 7,978.25

Step by Step Solution

1. Step 1: Write the proportion equation
   13,011.26 : 17,955.86 = 7,978.25 : x
2. Step 2: Convert to fraction form
   13,011.26/17,955.86 = 7,978.25/x
3. Step 3: Cross multiply
   13,011.26x = 17,955.86 × 7,978.25
4. Step 4: Simplify right side
   13,011.26x = 143,256,404.88
5. Step 5: Solve for x
   x = 143,256,404.88/13,011.26
6. Step 6: Final answer
   x = 11,010.19