Finding the Fourth Proportional to 399,618.96, 599,414.61 and 100,102.12

Step by Step Solution

1. Step 1: Write the proportion equation
   399,618.96 : 599,414.61 = 100,102.12 : x
2. Step 2: Convert to fraction form
   399,618.96/599,414.61 = 100,102.12/x
3. Step 3: Cross multiply
   399,618.96x = 599,414.61 × 100,102.12
4. Step 4: Simplify right side
   399,618.96x = 60,002,672,096.82
5. Step 5: Solve for x
   x = 60,002,672,096.82/399,618.96
6. Step 6: Final answer
   x = 150,149.71