Finding the Fourth Proportional to 811,061.88, 1,216,662 and 212,022.06

Step by Step Solution

1. Step 1: Write the proportion equation
   811,061.88 : 1,216,662 = 212,022.06 : x
2. Step 2: Convert to fraction form
   811,061.88/1,216,662 = 212,022.06/x
3. Step 3: Cross multiply
   811,061.88x = 1,216,662 × 212,022.06
4. Step 4: Simplify right side
   811,061.88x = 257,959,183,563.72
5. Step 5: Solve for x
   x = 257,959,183,563.72/811,061.88
6. Step 6: Final answer
   x = 318,051.17