Finding the Fourth Proportional to 78,688.56, 108,588.81 and 42,878.85

Step by Step Solution

1. Step 1: Write the proportion equation
   78,688.56 : 108,588.81 = 42,878.85 : x
2. Step 2: Convert to fraction form
   78,688.56/108,588.81 = 42,878.85/x
3. Step 3: Cross multiply
   78,688.56x = 108,588.81 × 42,878.85
4. Step 4: Simplify right side
   78,688.56x = 4,656,163,295.67
5. Step 5: Solve for x
   x = 4,656,163,295.67/78,688.56
6. Step 6: Final answer
   x = 59,172.05