Finding the Fourth Proportional to 465,667.60, 642,674.57 and 258,956.61

Step by Step Solution

1. Step 1: Write the proportion equation
   465,667.60 : 642,674.57 = 258,956.61 : x
2. Step 2: Convert to fraction form
   465,667.60/642,674.57 = 258,956.61/x
3. Step 3: Cross multiply
   465,667.60x = 642,674.57 × 258,956.61
4. Step 4: Simplify right side
   465,667.60x = 166,424,829,347.27
5. Step 5: Solve for x
   x = 166,424,829,347.27/465,667.60
6. Step 6: Final answer
   x = 357,389.76