Finding the Fourth Proportional to 13,978.69, 19,290.64 and 7,605.28

Step by Step Solution

1. Step 1: Write the proportion equation
   13,978.69 : 19,290.64 = 7,605.28 : x
2. Step 2: Convert to fraction form
   13,978.69/19,290.64 = 7,605.28/x
3. Step 3: Cross multiply
   13,978.69x = 19,290.64 × 7,605.28
4. Step 4: Simplify right side
   13,978.69x = 146,710,597.34
5. Step 5: Solve for x
   x = 146,710,597.34/13,978.69
6. Step 6: Final answer
   x = 10,495.30