Finding the Fourth Proportional to 456,384.50, 684,913.10 and 216,499.15

Step by Step Solution

1. Step 1: Write the proportion equation
   456,384.50 : 684,913.10 = 216,499.15 : x
2. Step 2: Convert to fraction form
   456,384.50/684,913.10 = 216,499.15/x
3. Step 3: Cross multiply
   456,384.50x = 684,913.10 × 216,499.15
4. Step 4: Simplify right side
   456,384.50x = 148,283,103,973.87
5. Step 5: Solve for x
   x = 148,283,103,973.87/456,384.50
6. Step 6: Final answer
   x = 324,908.29