Finding the Fourth Proportional to 658,638.72, 908,925.18 and 356,832.72

Step by Step Solution

1. Step 1: Write the proportion equation
   658,638.72 : 908,925.18 = 356,832.72 : x
2. Step 2: Convert to fraction form
   658,638.72/908,925.18 = 356,832.72/x
3. Step 3: Cross multiply
   658,638.72x = 908,925.18 × 356,832.72
4. Step 4: Simplify right side
   658,638.72x = 324,334,244,255.89
5. Step 5: Solve for x
   x = 324,334,244,255.89/658,638.72
6. Step 6: Final answer
   x = 492,431.18