Finding the Fourth Proportional to 680,978.50, 1,021,465.00 and 207,662.49

Step by Step Solution

1. Step 1: Write the proportion equation
   680,978.50 : 1,021,465.00 = 207,662.49 : x
2. Step 2: Convert to fraction form
   680,978.50/1,021,465.00 = 207,662.49/x
3. Step 3: Cross multiply
   680,978.50x = 1,021,465.00 × 207,662.49
4. Step 4: Simplify right side
   680,978.50x = 212,119,964,828.69
5. Step 5: Solve for x
   x = 212,119,964,828.69/680,978.50
6. Step 6: Final answer
   x = 311,492.90