Finding the Fourth Proportional to 395,111.12, 592,606.56 and 128,871.26

Step by Step Solution

1. Step 1: Write the proportion equation
   395,111.12 : 592,606.56 = 128,871.26 : x
2. Step 2: Convert to fraction form
   395,111.12/592,606.56 = 128,871.26/x
3. Step 3: Cross multiply
   395,111.12x = 592,606.56 × 128,871.26
4. Step 4: Simplify right side
   395,111.12x = 76,369,954,071.47
5. Step 5: Solve for x
   x = 76,369,954,071.47/395,111.12
6. Step 6: Final answer
   x = 193,287.28