Finding the Fourth Proportional to 259,819.61, 389,754.27 and 72,830.57

Step by Step Solution

1. Step 1: Write the proportion equation
   259,819.61 : 389,754.27 = 72,830.57 : x
2. Step 2: Convert to fraction form
   259,819.61/389,754.27 = 72,830.57/x
3. Step 3: Cross multiply
   259,819.61x = 389,754.27 × 72,830.57
4. Step 4: Simplify right side
   259,819.61x = 28,386,025,644.03
5. Step 5: Solve for x
   x = 28,386,025,644.03/259,819.61
6. Step 6: Final answer
   x = 109,252.82