Finding the Fourth Proportional to 259,283, 388,990.12 and 72,294.50

Step by Step Solution

1. Step 1: Write the proportion equation
   259,283 : 388,990.12 = 72,294.50 : x
2. Step 2: Convert to fraction form
   259,283/388,990.12 = 72,294.50/x
3. Step 3: Cross multiply
   259,283x = 388,990.12 × 72,294.50
4. Step 4: Simplify right side
   259,283x = 28,121,846,230.34
5. Step 5: Solve for x
   x = 28,121,846,230.34/259,283
6. Step 6: Final answer
   x = 108,460.05