Finding the Fourth Proportional to 345,499.72, 517,079.08 and 212,464.24

Step by Step Solution

1. Step 1: Write the proportion equation
   345,499.72 : 517,079.08 = 212,464.24 : x
2. Step 2: Convert to fraction form
   345,499.72/517,079.08 = 212,464.24/x
3. Step 3: Cross multiply
   345,499.72x = 517,079.08 × 212,464.24
4. Step 4: Simplify right side
   345,499.72x = 109,860,813,752.10
5. Step 5: Solve for x
   x = 109,860,813,752.10/345,499.72
6. Step 6: Final answer
   x = 317,976.56