Finding the Fourth Proportional to 13,978.25, 19,289.99 and 7,690.49

Step by Step Solution

1. Step 1: Write the proportion equation
   13,978.25 : 19,289.99 = 7,690.49 : x
2. Step 2: Convert to fraction form
   13,978.25/19,289.99 = 7,690.49/x
3. Step 3: Cross multiply
   13,978.25x = 19,289.99 × 7,690.49
4. Step 4: Simplify right side
   13,978.25x = 148,349,436.74
5. Step 5: Solve for x
   x = 148,349,436.74/13,978.25
6. Step 6: Final answer
   x = 10,612.88