Finding the Fourth Proportional to 57,159.41, 79,355.15 and 55,448.69

Step by Step Solution

1. Step 1: Write the proportion equation
   57,159.41 : 79,355.15 = 55,448.69 : x
2. Step 2: Convert to fraction form
   57,159.41/79,355.15 = 55,448.69/x
3. Step 3: Cross multiply
   57,159.41x = 79,355.15 × 55,448.69
4. Step 4: Simplify right side
   57,159.41x = 4,400,139,112.25
5. Step 5: Solve for x
   x = 4,400,139,112.25/57,159.41
6. Step 6: Final answer
   x = 76,980.14