Finding the Fourth Proportional to 78,480.38, 108,302.78 and 42,670.31

Step by Step Solution

1. Step 1: Write the proportion equation
   78,480.38 : 108,302.78 = 42,670.31 : x
2. Step 2: Convert to fraction form
   78,480.38/108,302.78 = 42,670.31/x
3. Step 3: Cross multiply
   78,480.38x = 108,302.78 × 42,670.31
4. Step 4: Simplify right side
   78,480.38x = 4,621,312,703.91
5. Step 5: Solve for x
   x = 4,621,312,703.91/78,480.38
6. Step 6: Final answer
   x = 58,884.94