Finding the Fourth Proportional to 128,991.86, 193,562.50 and 54,105.34

Step by Step Solution

1. Step 1: Write the proportion equation
   128,991.86 : 193,562.50 = 54,105.34 : x
2. Step 2: Convert to fraction form
   128,991.86/193,562.50 = 54,105.34/x
3. Step 3: Cross multiply
   128,991.86x = 193,562.50 × 54,105.34
4. Step 4: Simplify right side
   128,991.86x = 10,472,764,873.75
5. Step 5: Solve for x
   x = 10,472,764,873.75/128,991.86
6. Step 6: Final answer
   x = 81,189.35