Finding the Fourth Proportional to 76,436.37, 105,478.64 and 42,447.01

Step by Step Solution

1. Step 1: Write the proportion equation
   76,436.37 : 105,478.64 = 42,447.01 : x
2. Step 2: Convert to fraction form
   76,436.37/105,478.64 = 42,447.01/x
3. Step 3: Cross multiply
   76,436.37x = 105,478.64 × 42,447.01
4. Step 4: Simplify right side
   76,436.37x = 4,477,253,243.62
5. Step 5: Solve for x
   x = 4,477,253,243.62/76,436.37
6. Step 6: Final answer
   x = 58,574.91