Finding the Fourth Proportional to 375,981.67, 518,978.78 and 336,123.60

Step by Step Solution

1. Step 1: Write the proportion equation
   375,981.67 : 518,978.78 = 336,123.60 : x
2. Step 2: Convert to fraction form
   375,981.67/518,978.78 = 336,123.60/x
3. Step 3: Cross multiply
   375,981.67x = 518,978.78 × 336,123.60
4. Step 4: Simplify right side
   375,981.67x = 174,441,015,857.21
5. Step 5: Solve for x
   x = 174,441,015,857.21/375,981.67
6. Step 6: Final answer
   x = 463,961.49