Finding the Fourth Proportional to 78,428.63, 108,229.33 and 42,617.45

Step by Step Solution

1. Step 1: Write the proportion equation
   78,428.63 : 108,229.33 = 42,617.45 : x
2. Step 2: Convert to fraction form
   78,428.63/108,229.33 = 42,617.45/x
3. Step 3: Cross multiply
   78,428.63x = 108,229.33 × 42,617.45
4. Step 4: Simplify right side
   78,428.63x = 4,612,458,383.65
5. Step 5: Solve for x
   x = 4,612,458,383.65/78,428.63
6. Step 6: Final answer
   x = 58,810.90