Finding the Fourth Proportional to 76,436.80, 105,479.76 and 42,447.04

Step by Step Solution

1. Step 1: Write the proportion equation
   76,436.80 : 105,479.76 = 42,447.04 : x
2. Step 2: Convert to fraction form
   76,436.80/105,479.76 = 42,447.04/x
3. Step 3: Cross multiply
   76,436.80x = 105,479.76 × 42,447.04
4. Step 4: Simplify right side
   76,436.80x = 4,477,303,591.91
5. Step 5: Solve for x
   x = 4,477,303,591.91/76,436.80
6. Step 6: Final answer
   x = 58,575.24