Finding the Fourth Proportional to 458,953.89, 687,846.69 and 259,385.55

Step by Step Solution

1. Step 1: Write the proportion equation
   458,953.89 : 687,846.69 = 259,385.55 : x
2. Step 2: Convert to fraction form
   458,953.89/687,846.69 = 259,385.55/x
3. Step 3: Cross multiply
   458,953.89x = 687,846.69 × 259,385.55
4. Step 4: Simplify right side
   458,953.89x = 178,417,492,001.33
5. Step 5: Solve for x
   x = 178,417,492,001.33/458,953.89
6. Step 6: Final answer
   x = 388,748.19