Finding the Fourth Proportional to 418,871.02, 623,568.72 and 416,379.86

Step by Step Solution

1. Step 1: Write the proportion equation
   418,871.02 : 623,568.72 = 416,379.86 : x
2. Step 2: Convert to fraction form
   418,871.02/623,568.72 = 416,379.86/x
3. Step 3: Cross multiply
   418,871.02x = 623,568.72 × 416,379.86
4. Step 4: Simplify right side
   418,871.02x = 259,641,456,333.98
5. Step 5: Solve for x
   x = 259,641,456,333.98/418,871.02
6. Step 6: Final answer
   x = 619,860.16