Finding the Fourth Proportional to 78,722.79, 108,635.29 and 42,913.50

Step by Step Solution

1. Step 1: Write the proportion equation
   78,722.79 : 108,635.29 = 42,913.50 : x
2. Step 2: Convert to fraction form
   78,722.79/108,635.29 = 42,913.50/x
3. Step 3: Cross multiply
   78,722.79x = 108,635.29 × 42,913.50
4. Step 4: Simplify right side
   78,722.79x = 4,661,920,517.42
5. Step 5: Solve for x
   x = 4,661,920,517.42/78,722.79
6. Step 6: Final answer
   x = 59,219.45