Finding the Fourth Proportional to 171,990.64, 258,085.59 and 72,141.94

Step by Step Solution

1. Step 1: Write the proportion equation
   171,990.64 : 258,085.59 = 72,141.94 : x
2. Step 2: Convert to fraction form
   171,990.64/258,085.59 = 72,141.94/x
3. Step 3: Cross multiply
   171,990.64x = 258,085.59 × 72,141.94
4. Step 4: Simplify right side
   171,990.64x = 18,618,795,148.64
5. Step 5: Solve for x
   x = 18,618,795,148.64/171,990.64
6. Step 6: Final answer
   x = 108,254.70