Finding the Fourth Proportional to 76,298.30, 105,287.40 and 42,304.79

Step by Step Solution

1. Step 1: Write the proportion equation
   76,298.30 : 105,287.40 = 42,304.79 : x
2. Step 2: Convert to fraction form
   76,298.30/105,287.40 = 42,304.79/x
3. Step 3: Cross multiply
   76,298.30x = 105,287.40 × 42,304.79
4. Step 4: Simplify right side
   76,298.30x = 4,454,161,346.65
5. Step 5: Solve for x
   x = 4,454,161,346.65/76,298.30
6. Step 6: Final answer
   x = 58,378.25