Finding the Fourth Proportional to 78,431.82, 108,233.73 and 42,620.64

Step by Step Solution

1. Step 1: Write the proportion equation
   78,431.82 : 108,233.73 = 42,620.64 : x
2. Step 2: Convert to fraction form
   78,431.82/108,233.73 = 42,620.64/x
3. Step 3: Cross multiply
   78,431.82x = 108,233.73 × 42,620.64
4. Step 4: Simplify right side
   78,431.82x = 4,612,990,842.19
5. Step 5: Solve for x
   x = 4,612,990,842.19/78,431.82
6. Step 6: Final answer
   x = 58,815.30