Finding the Fourth Proportional to 76,670.38, 105,805.08 and 42,678.12

Step by Step Solution

1. Step 1: Write the proportion equation
   76,670.38 : 105,805.08 = 42,678.12 : x
2. Step 2: Convert to fraction form
   76,670.38/105,805.08 = 42,678.12/x
3. Step 3: Cross multiply
   76,670.38x = 105,805.08 × 42,678.12
4. Step 4: Simplify right side
   76,670.38x = 4,515,561,900.85
5. Step 5: Solve for x
   x = 4,515,561,900.85/76,670.38
6. Step 6: Final answer
   x = 58,895.78