Finding the Fourth Proportional to 418,978.77, 628,469.46 and 103,435.71

Step by Step Solution

1. Step 1: Write the proportion equation
   418,978.77 : 628,469.46 = 103,435.71 : x
2. Step 2: Convert to fraction form
   418,978.77/628,469.46 = 103,435.71/x
3. Step 3: Cross multiply
   418,978.77x = 628,469.46 × 103,435.71
4. Step 4: Simplify right side
   418,978.77x = 65,006,184,808.42
5. Step 5: Solve for x
   x = 65,006,184,808.42/418,978.77
6. Step 6: Final answer
   x = 155,153.89