Finding the Fourth Proportional to 128,987.86, 193,556.50 and 54,101.34

Step by Step Solution

1. Step 1: Write the proportion equation
   128,987.86 : 193,556.50 = 54,101.34 : x
2. Step 2: Convert to fraction form
   128,987.86/193,556.50 = 54,101.34/x
3. Step 3: Cross multiply
   128,987.86x = 193,556.50 × 54,101.34
4. Step 4: Simplify right side
   128,987.86x = 10,471,666,015.71
5. Step 5: Solve for x
   x = 10,471,666,015.71/128,987.86
6. Step 6: Final answer
   x = 81,183.35