Finding the Fourth Proportional to 76,708.12, 105,854.32 and 42,718

Step by Step Solution

1. Step 1: Write the proportion equation
   76,708.12 : 105,854.32 = 42,718 : x
2. Step 2: Convert to fraction form
   76,708.12/105,854.32 = 42,718/x
3. Step 3: Cross multiply
   76,708.12x = 105,854.32 × 42,718
4. Step 4: Simplify right side
   76,708.12x = 4,521,884,841.76
5. Step 5: Solve for x
   x = 4,521,884,841.76/76,708.12
6. Step 6: Final answer
   x = 58,949.23