Finding the Fourth Proportional to 369,071.89, 509,316.89 and 207,978.68

Step by Step Solution

1. Step 1: Write the proportion equation
   369,071.89 : 509,316.89 = 207,978.68 : x
2. Step 2: Convert to fraction form
   369,071.89/509,316.89 = 207,978.68/x
3. Step 3: Cross multiply
   369,071.89x = 509,316.89 × 207,978.68
4. Step 4: Simplify right side
   369,071.89x = 105,927,054,717.30
5. Step 5: Solve for x
   x = 105,927,054,717.30/369,071.89
6. Step 6: Final answer
   x = 287,009.27