Finding the Fourth Proportional to 76,129.89, 105,056.56 and 42,138.44

Step by Step Solution

1. Step 1: Write the proportion equation
   76,129.89 : 105,056.56 = 42,138.44 : x
2. Step 2: Convert to fraction form
   76,129.89/105,056.56 = 42,138.44/x
3. Step 3: Cross multiply
   76,129.89x = 105,056.56 × 42,138.44
4. Step 4: Simplify right side
   76,129.89x = 4,426,919,707.46
5. Step 5: Solve for x
   x = 4,426,919,707.46/76,129.89
6. Step 6: Final answer
   x = 58,149.56