Finding the Fourth Proportional to 58,238.69, 80,419.80 and 55,249.31

Step by Step Solution

1. Step 1: Write the proportion equation
   58,238.69 : 80,419.80 = 55,249.31 : x
2. Step 2: Convert to fraction form
   58,238.69/80,419.80 = 55,249.31/x
3. Step 3: Cross multiply
   58,238.69x = 80,419.80 × 55,249.31
4. Step 4: Simplify right side
   58,238.69x = 4,443,138,460.34
5. Step 5: Solve for x
   x = 4,443,138,460.34/58,238.69
6. Step 6: Final answer
   x = 76,291.87