Finding the Fourth Proportional to 308,456.91, 425,667.05 and 172,488.99

Step by Step Solution

1. Step 1: Write the proportion equation
   308,456.91 : 425,667.05 = 172,488.99 : x
2. Step 2: Convert to fraction form
   308,456.91/425,667.05 = 172,488.99/x
3. Step 3: Cross multiply
   308,456.91x = 425,667.05 × 172,488.99
4. Step 4: Simplify right side
   308,456.91x = 73,422,880,911.42
5. Step 5: Solve for x
   x = 73,422,880,911.42/308,456.91
6. Step 6: Final answer
   x = 238,032.86