Finding the Fourth Proportional to 172,709.78, 259,099.59 and 72,870.18

Step by Step Solution

1. Step 1: Write the proportion equation
   172,709.78 : 259,099.59 = 72,870.18 : x
2. Step 2: Convert to fraction form
   172,709.78/259,099.59 = 72,870.18/x
3. Step 3: Cross multiply
   172,709.78x = 259,099.59 × 72,870.18
4. Step 4: Simplify right side
   172,709.78x = 18,880,633,761.23
5. Step 5: Solve for x
   x = 18,880,633,761.23/172,709.78
6. Step 6: Final answer
   x = 109,320.01