Finding the Fourth Proportional to 303,498.28, 455,130.78 and 209,719.72

Step by Step Solution

1. Step 1: Write the proportion equation
   303,498.28 : 455,130.78 = 209,719.72 : x
2. Step 2: Convert to fraction form
   303,498.28/455,130.78 = 209,719.72/x
3. Step 3: Cross multiply
   303,498.28x = 455,130.78 × 209,719.72
4. Step 4: Simplify right side
   303,498.28x = 95,449,899,744.98
5. Step 5: Solve for x
   x = 95,449,899,744.98/303,498.28
6. Step 6: Final answer
   x = 314,498.98