Finding the Fourth Proportional to 133,105.86, 199,486.44 and 54,128.34

Step by Step Solution

1. Step 1: Write the proportion equation
   133,105.86 : 199,486.44 = 54,128.34 : x
2. Step 2: Convert to fraction form
   133,105.86/199,486.44 = 54,128.34/x
3. Step 3: Cross multiply
   133,105.86x = 199,486.44 × 54,128.34
4. Step 4: Simplify right side
   133,105.86x = 10,797,869,849.71
5. Step 5: Solve for x
   x = 10,797,869,849.71/133,105.86
6. Step 6: Final answer
   x = 81,122.42