Finding the Fourth Proportional to 76,436.93, 105,479.42 and 42,447.58

Step by Step Solution

1. Step 1: Write the proportion equation
   76,436.93 : 105,479.42 = 42,447.58 : x
2. Step 2: Convert to fraction form
   76,436.93/105,479.42 = 42,447.58/x
3. Step 3: Cross multiply
   76,436.93x = 105,479.42 × 42,447.58
4. Step 4: Simplify right side
   76,436.93x = 4,477,345,881.63
5. Step 5: Solve for x
   x = 4,477,345,881.63/76,436.93
6. Step 6: Final answer
   x = 58,575.69