Finding the Fourth Proportional to 499,018.34, 751,894.31 and 412,215.50

Step by Step Solution

1. Step 1: Write the proportion equation
   499,018.34 : 751,894.31 = 412,215.50 : x
2. Step 2: Convert to fraction form
   499,018.34/751,894.31 = 412,215.50/x
3. Step 3: Cross multiply
   499,018.34x = 751,894.31 × 412,215.50
4. Step 4: Simplify right side
   499,018.34x = 309,942,483,123.26
5. Step 5: Solve for x
   x = 309,942,483,123.26/499,018.34
6. Step 6: Final answer
   x = 621,104.40