Finding the Fourth Proportional to 76,728.46, 105,888.15 and 42,274.61

Step by Step Solution

1. Step 1: Write the proportion equation
   76,728.46 : 105,888.15 = 42,274.61 : x
2. Step 2: Convert to fraction form
   76,728.46/105,888.15 = 42,274.61/x
3. Step 3: Cross multiply
   76,728.46x = 105,888.15 × 42,274.61
4. Step 4: Simplify right side
   76,728.46x = 4,476,380,244.87
5. Step 5: Solve for x
   x = 4,476,380,244.87/76,728.46
6. Step 6: Final answer
   x = 58,340.55