Finding the Fourth Proportional to 128,714.55, 193,066.56 and 53,815.47

Step by Step Solution

1. Step 1: Write the proportion equation
   128,714.55 : 193,066.56 = 53,815.47 : x
2. Step 2: Convert to fraction form
   128,714.55/193,066.56 = 53,815.47/x
3. Step 3: Cross multiply
   128,714.55x = 193,066.56 × 53,815.47
4. Step 4: Simplify right side
   128,714.55x = 10,389,967,667.68
5. Step 5: Solve for x
   x = 10,389,967,667.68/128,714.55
6. Step 6: Final answer
   x = 80,721.00