Finding the Third Proportional to 276,696 and 420,784.88

Step by Step Solution

1. Step 1: Write the proportion equation
   276,696 : 420,784.88 = 420,784.88 : x
2. Step 2: Convert to fraction form
   276,696/420,784.88 = 420,784.88/x
3. Step 3: Cross multiply
   276,696x = 420,784.88 × 420,784.88
4. Step 4: Simplify right side
   276,696x = 177,059,911,028.77
5. Step 5: Solve for x
   x = 177,059,911,028.77/276,696
6. Step 6: Final answer
   x = 639,907.74