Finding the Fourth Proportional to 39,978.96, 59,968.42 and 11,898.88

Step by Step Solution

1. Step 1: Write the proportion equation
   39,978.96 : 59,968.42 = 11,898.88 : x
2. Step 2: Convert to fraction form
   39,978.96/59,968.42 = 11,898.88/x
3. Step 3: Cross multiply
   39,978.96x = 59,968.42 × 11,898.88
4. Step 4: Simplify right side
   39,978.96x = 713,557,033.37
5. Step 5: Solve for x
   x = 713,557,033.37/39,978.96
6. Step 6: Final answer
   x = 17,848.31