Finding the Fourth Proportional to 172,298.61, 258,452.78 and 47,639.61

Step by Step Solution

1. Step 1: Write the proportion equation
   172,298.61 : 258,452.78 = 47,639.61 : x
2. Step 2: Convert to fraction form
   172,298.61/258,452.78 = 47,639.61/x
3. Step 3: Cross multiply
   172,298.61x = 258,452.78 × 47,639.61
4. Step 4: Simplify right side
   172,298.61x = 12,312,589,404.42
5. Step 5: Solve for x
   x = 12,312,589,404.42/172,298.61
6. Step 6: Final answer
   x = 71,460.76