Finding the Fourth Proportional to 308,111.36, 425,151.84 and 172,128.56

Step by Step Solution

1. Step 1: Write the proportion equation
   308,111.36 : 425,151.84 = 172,128.56 : x
2. Step 2: Convert to fraction form
   308,111.36/425,151.84 = 172,128.56/x
3. Step 3: Cross multiply
   308,111.36x = 425,151.84 × 172,128.56
4. Step 4: Simplify right side
   308,111.36x = 73,180,774,000.55
5. Step 5: Solve for x
   x = 73,180,774,000.55/308,111.36
6. Step 6: Final answer
   x = 237,514.04