Finding the Fourth Proportional to 438,658.30, 658,010.82 and 139,162.82

Step by Step Solution

1. Step 1: Write the proportion equation
   438,658.30 : 658,010.82 = 139,162.82 : x
2. Step 2: Convert to fraction form
   438,658.30/658,010.82 = 139,162.82/x
3. Step 3: Cross multiply
   438,658.30x = 658,010.82 × 139,162.82
4. Step 4: Simplify right side
   438,658.30x = 91,570,641,301.71
5. Step 5: Solve for x
   x = 91,570,641,301.71/438,658.30
6. Step 6: Final answer
   x = 208,751.64