Finding the Fourth Proportional to 76,436.39, 105,478.70 and 42,447.06

Step by Step Solution

1. Step 1: Write the proportion equation
   76,436.39 : 105,478.70 = 42,447.06 : x
2. Step 2: Convert to fraction form
   76,436.39/105,478.70 = 42,447.06/x
3. Step 3: Cross multiply
   76,436.39x = 105,478.70 × 42,447.06
4. Step 4: Simplify right side
   76,436.39x = 4,477,260,495.39
5. Step 5: Solve for x
   x = 4,477,260,495.39/76,436.39
6. Step 6: Final answer
   x = 58,574.98