Finding the Fourth Proportional to 400,978.38, 553,264.05 and 237,686.37

Step by Step Solution

1. Step 1: Write the proportion equation
   400,978.38 : 553,264.05 = 237,686.37 : x
2. Step 2: Convert to fraction form
   400,978.38/553,264.05 = 237,686.37/x
3. Step 3: Cross multiply
   400,978.38x = 553,264.05 × 237,686.37
4. Step 4: Simplify right side
   400,978.38x = 131,503,323,696.00
5. Step 5: Solve for x
   x = 131,503,323,696.00/400,978.38
6. Step 6: Final answer
   x = 327,956.14