Finding the Fourth Proportional to 401,152.16, 553,650.98 and 256,020.57

Step by Step Solution

1. Step 1: Write the proportion equation
   401,152.16 : 553,650.98 = 256,020.57 : x
2. Step 2: Convert to fraction form
   401,152.16/553,650.98 = 256,020.57/x
3. Step 3: Cross multiply
   401,152.16x = 553,650.98 × 256,020.57
4. Step 4: Simplify right side
   401,152.16x = 141,746,038,200.56
5. Step 5: Solve for x
   x = 141,746,038,200.56/401,152.16
6. Step 6: Final answer
   x = 353,347.31