Finding the Fourth Proportional to 355,522.77, 490,629.15 and 212,256.09

Step by Step Solution

1. Step 1: Write the proportion equation
   355,522.77 : 490,629.15 = 212,256.09 : x
2. Step 2: Convert to fraction form
   355,522.77/490,629.15 = 212,256.09/x
3. Step 3: Cross multiply
   355,522.77x = 490,629.15 × 212,256.09
4. Step 4: Simplify right side
   355,522.77x = 104,139,025,019.02
5. Step 5: Solve for x
   x = 104,139,025,019.02/355,522.77
6. Step 6: Final answer
   x = 292,918.02