Finding the Fourth Proportional to 257,504, 386,238.72 and 70,517.12

Step by Step Solution

1. Step 1: Write the proportion equation
   257,504 : 386,238.72 = 70,517.12 : x
2. Step 2: Convert to fraction form
   257,504/386,238.72 = 70,517.12/x
3. Step 3: Cross multiply
   257,504x = 386,238.72 × 70,517.12
4. Step 4: Simplify right side
   257,504x = 27,236,442,166.89
5. Step 5: Solve for x
   x = 27,236,442,166.89/257,504
6. Step 6: Final answer
   x = 105,770.95