Finding the Fourth Proportional to 65,980.18, 91,067.52 and 55,351.36

Step by Step Solution

1. Step 1: Write the proportion equation
   65,980.18 : 91,067.52 = 55,351.36 : x
2. Step 2: Convert to fraction form
   65,980.18/91,067.52 = 55,351.36/x
3. Step 3: Cross multiply
   65,980.18x = 91,067.52 × 55,351.36
4. Step 4: Simplify right side
   65,980.18x = 5,040,711,083.83
5. Step 5: Solve for x
   x = 5,040,711,083.83/65,980.18
6. Step 6: Final answer
   x = 76,397.35