Finding the Fourth Proportional to 401,128.53, 553,238.51 and 340,898.55

Step by Step Solution

1. Step 1: Write the proportion equation
   401,128.53 : 553,238.51 = 340,898.55 : x
2. Step 2: Convert to fraction form
   401,128.53/553,238.51 = 340,898.55/x
3. Step 3: Cross multiply
   401,128.53x = 553,238.51 × 340,898.55
4. Step 4: Simplify right side
   401,128.53x = 188,598,204,158.67
5. Step 5: Solve for x
   x = 188,598,204,158.67/401,128.53
6. Step 6: Final answer
   x = 470,169.01