Finding the Fourth Proportional to 402,412.35, 555,169.89 and 259,255.89

Step by Step Solution

1. Step 1: Write the proportion equation
   402,412.35 : 555,169.89 = 259,255.89 : x
2. Step 2: Convert to fraction form
   402,412.35/555,169.89 = 259,255.89/x
3. Step 3: Cross multiply
   402,412.35x = 555,169.89 × 259,255.89
4. Step 4: Simplify right side
   402,412.35x = 143,931,063,933.15
5. Step 5: Solve for x
   x = 143,931,063,933.15/402,412.35
6. Step 6: Final answer
   x = 357,670.59