Finding the Fourth Proportional to 439,578.72, 606,618.72 and 238,374.72

Step by Step Solution

1. Step 1: Write the proportion equation
   439,578.72 : 606,618.72 = 238,374.72 : x
2. Step 2: Convert to fraction form
   439,578.72/606,618.72 = 238,374.72/x
3. Step 3: Cross multiply
   439,578.72x = 606,618.72 × 238,374.72
4. Step 4: Simplify right side
   439,578.72x = 144,602,567,526.76
5. Step 5: Solve for x
   x = 144,602,567,526.76/439,578.72
6. Step 6: Final answer
   x = 328,957.16