Finding the Fourth Proportional to 13,978.74, 19,283.30 and 8,309.45

Step by Step Solution

1. Step 1: Write the proportion equation
   13,978.74 : 19,283.30 = 8,309.45 : x
2. Step 2: Convert to fraction form
   13,978.74/19,283.30 = 8,309.45/x
3. Step 3: Cross multiply
   13,978.74x = 19,283.30 × 8,309.45
4. Step 4: Simplify right side
   13,978.74x = 160,233,642.22
5. Step 5: Solve for x
   x = 160,233,642.22/13,978.74
6. Step 6: Final answer
   x = 11,462.67