Finding the Fourth Proportional to 76,706.89, 105,855.59 and 42,721.92

Step by Step Solution

1. Step 1: Write the proportion equation
   76,706.89 : 105,855.59 = 42,721.92 : x
2. Step 2: Convert to fraction form
   76,706.89/105,855.59 = 42,721.92/x
3. Step 3: Cross multiply
   76,706.89x = 105,855.59 × 42,721.92
4. Step 4: Simplify right side
   76,706.89x = 4,522,354,047.53
5. Step 5: Solve for x
   x = 4,522,354,047.53/76,706.89
6. Step 6: Final answer
   x = 58,956.30