Finding the Fourth Proportional to 78,723.01, 108,638.85 and 42,912.94

Step by Step Solution

1. Step 1: Write the proportion equation
   78,723.01 : 108,638.85 = 42,912.94 : x
2. Step 2: Convert to fraction form
   78,723.01/108,638.85 = 42,912.94/x
3. Step 3: Cross multiply
   78,723.01x = 108,638.85 × 42,912.94
4. Step 4: Simplify right side
   78,723.01x = 4,662,012,451.72
5. Step 5: Solve for x
   x = 4,662,012,451.72/78,723.01
6. Step 6: Final answer
   x = 59,220.45