Finding the Fourth Proportional to 493,492.56, 680,978.71 and 289,522.14

Step by Step Solution

1. Step 1: Write the proportion equation
   493,492.56 : 680,978.71 = 289,522.14 : x
2. Step 2: Convert to fraction form
   493,492.56/680,978.71 = 289,522.14/x
3. Step 3: Cross multiply
   493,492.56x = 680,978.71 × 289,522.14
4. Step 4: Simplify right side
   493,492.56x = 197,158,410,008.75
5. Step 5: Solve for x
   x = 197,158,410,008.75/493,492.56
6. Step 6: Final answer
   x = 399,516.48