Finding the Fourth Proportional to 107,978.80, 161,895.30 and 57,386.20

Step by Step Solution

1. Step 1: Write the proportion equation
   107,978.80 : 161,895.30 = 57,386.20 : x
2. Step 2: Convert to fraction form
   107,978.80/161,895.30 = 57,386.20/x
3. Step 3: Cross multiply
   107,978.80x = 161,895.30 × 57,386.20
4. Step 4: Simplify right side
   107,978.80x = 9,290,556,064.86
5. Step 5: Solve for x
   x = 9,290,556,064.86/107,978.80
6. Step 6: Final answer
   x = 86,040.56