Finding the Fourth Proportional to 13,978.44, 19,290.24 and 7,690.77

Step by Step Solution

1. Step 1: Write the proportion equation
   13,978.44 : 19,290.24 = 7,690.77 : x
2. Step 2: Convert to fraction form
   13,978.44/19,290.24 = 7,690.77/x
3. Step 3: Cross multiply
   13,978.44x = 19,290.24 × 7,690.77
4. Step 4: Simplify right side
   13,978.44x = 148,356,799.08
5. Step 5: Solve for x
   x = 148,356,799.08/13,978.44
6. Step 6: Final answer
   x = 10,613.26