Finding the Fourth Proportional to 76,199.12, 105,158.24 and 42,665.12

Step by Step Solution

1. Step 1: Write the proportion equation
   76,199.12 : 105,158.24 = 42,665.12 : x
2. Step 2: Convert to fraction form
   76,199.12/105,158.24 = 42,665.12/x
3. Step 3: Cross multiply
   76,199.12x = 105,158.24 × 42,665.12
4. Step 4: Simplify right side
   76,199.12x = 4,486,588,928.59
5. Step 5: Solve for x
   x = 4,486,588,928.59/76,199.12
6. Step 6: Final answer
   x = 58,879.80