Finding the Fourth Proportional to 76,421.81, 105,474.69 and 42,441.30

Step by Step Solution

1. Step 1: Write the proportion equation
   76,421.81 : 105,474.69 = 42,441.30 : x
2. Step 2: Convert to fraction form
   76,421.81/105,474.69 = 42,441.30/x
3. Step 3: Cross multiply
   76,421.81x = 105,474.69 × 42,441.30
4. Step 4: Simplify right side
   76,421.81x = 4,476,482,960.70
5. Step 5: Solve for x
   x = 4,476,482,960.70/76,421.81
6. Step 6: Final answer
   x = 58,575.99