Finding the Fourth Proportional to 11,486.52, 17,219.38 and 7,978.18

Step by Step Solution

1. Step 1: Write the proportion equation
   11,486.52 : 17,219.38 = 7,978.18 : x
2. Step 2: Convert to fraction form
   11,486.52/17,219.38 = 7,978.18/x
3. Step 3: Cross multiply
   11,486.52x = 17,219.38 × 7,978.18
4. Step 4: Simplify right side
   11,486.52x = 137,379,313.13
5. Step 5: Solve for x
   x = 137,379,313.13/11,486.52
6. Step 6: Final answer
   x = 11,960.05