Finding the Fourth Proportional to 78,390.72, 108,176.08 and 42,580

Step by Step Solution

1. Step 1: Write the proportion equation
   78,390.72 : 108,176.08 = 42,580 : x
2. Step 2: Convert to fraction form
   78,390.72/108,176.08 = 42,580/x
3. Step 3: Cross multiply
   78,390.72x = 108,176.08 × 42,580
4. Step 4: Simplify right side
   78,390.72x = 4,606,137,486.40
5. Step 5: Solve for x
   x = 4,606,137,486.40/78,390.72
6. Step 6: Final answer
   x = 58,758.71