Finding the Fourth Proportional to 78,790.70, 108,727.17 and 42,980.42

Step by Step Solution

1. Step 1: Write the proportion equation
   78,790.70 : 108,727.17 = 42,980.42 : x
2. Step 2: Convert to fraction form
   78,790.70/108,727.17 = 42,980.42/x
3. Step 3: Cross multiply
   78,790.70x = 108,727.17 × 42,980.42
4. Step 4: Simplify right side
   78,790.70x = 4,673,139,432.01
5. Step 5: Solve for x
   x = 4,673,139,432.01/78,790.70
6. Step 6: Final answer
   x = 59,310.80