Finding the Fourth Proportional to 128,315.05, 192,505.41 and 53,410.30

Step by Step Solution

1. Step 1: Write the proportion equation
   128,315.05 : 192,505.41 = 53,410.30 : x
2. Step 2: Convert to fraction form
   128,315.05/192,505.41 = 53,410.30/x
3. Step 3: Cross multiply
   128,315.05x = 192,505.41 × 53,410.30
4. Step 4: Simplify right side
   128,315.05x = 10,281,771,699.72
5. Step 5: Solve for x
   x = 10,281,771,699.72/128,315.05
6. Step 6: Final answer
   x = 80,129.12