Finding the Fourth Proportional to 199,844.72, 275,655.12 and 128,111.12

Step by Step Solution

1. Step 1: Write the proportion equation
   199,844.72 : 275,655.12 = 128,111.12 : x
2. Step 2: Convert to fraction form
   199,844.72/275,655.12 = 128,111.12/x
3. Step 3: Cross multiply
   199,844.72x = 275,655.12 × 128,111.12
4. Step 4: Simplify right side
   199,844.72x = 35,314,486,156.93
5. Step 5: Solve for x
   x = 35,314,486,156.93/199,844.72
6. Step 6: Final answer
   x = 176,709.63