Finding the Fourth Proportional to 76,434.36, 105,479.88 and 42,443.40

Step by Step Solution

1. Step 1: Write the proportion equation
   76,434.36 : 105,479.88 = 42,443.40 : x
2. Step 2: Convert to fraction form
   76,434.36/105,479.88 = 42,443.40/x
3. Step 3: Cross multiply
   76,434.36x = 105,479.88 × 42,443.40
4. Step 4: Simplify right side
   76,434.36x = 4,476,924,738.79
5. Step 5: Solve for x
   x = 4,476,924,738.79/76,434.36
6. Step 6: Final answer
   x = 58,572.15