Finding the Fourth Proportional to 78,431.22, 108,235.00 and 42,621.15

Step by Step Solution

1. Step 1: Write the proportion equation
   78,431.22 : 108,235.00 = 42,621.15 : x
2. Step 2: Convert to fraction form
   78,431.22/108,235.00 = 42,621.15/x
3. Step 3: Cross multiply
   78,431.22x = 108,235.00 × 42,621.15
4. Step 4: Simplify right side
   78,431.22x = 4,613,100,629.41
5. Step 5: Solve for x
   x = 4,613,100,629.41/78,431.22
6. Step 6: Final answer
   x = 58,817.15