Finding the Fourth Proportional to 439,900.30, 607,069.49 and 238,696.30

Step by Step Solution

1. Step 1: Write the proportion equation
   439,900.30 : 607,069.49 = 238,696.30 : x
2. Step 2: Convert to fraction form
   439,900.30/607,069.49 = 238,696.30/x
3. Step 3: Cross multiply
   439,900.30x = 607,069.49 × 238,696.30
4. Step 4: Simplify right side
   439,900.30x = 144,905,241,105.89
5. Step 5: Solve for x
   x = 144,905,241,105.89/439,900.30
6. Step 6: Final answer
   x = 329,404.73