Finding the Fourth Proportional to 76,118.18, 105,040.50 and 42,128.10

Step by Step Solution

1. Step 1: Write the proportion equation
   76,118.18 : 105,040.50 = 42,128.10 : x
2. Step 2: Convert to fraction form
   76,118.18/105,040.50 = 42,128.10/x
3. Step 3: Cross multiply
   76,118.18x = 105,040.50 × 42,128.10
4. Step 4: Simplify right side
   76,118.18x = 4,425,156,688.05
5. Step 5: Solve for x
   x = 4,425,156,688.05/76,118.18
6. Step 6: Final answer
   x = 58,135.35