Finding the Fourth Proportional to 78,578.17, 108,440.16 and 42,770.50

Step by Step Solution

1. Step 1: Write the proportion equation
   78,578.17 : 108,440.16 = 42,770.50 : x
2. Step 2: Convert to fraction form
   78,578.17/108,440.16 = 42,770.50/x
3. Step 3: Cross multiply
   78,578.17x = 108,440.16 × 42,770.50
4. Step 4: Simplify right side
   78,578.17x = 4,638,039,863.28
5. Step 5: Solve for x
   x = 4,638,039,863.28/78,578.17
6. Step 6: Final answer
   x = 59,024.53