Finding the Fourth Proportional to 78,688.55, 108,588.78 and 42,878.85

Step by Step Solution

1. Step 1: Write the proportion equation
   78,688.55 : 108,588.78 = 42,878.85 : x
2. Step 2: Convert to fraction form
   78,688.55/108,588.78 = 42,878.85/x
3. Step 3: Cross multiply
   78,688.55x = 108,588.78 × 42,878.85
4. Step 4: Simplify right side
   78,688.55x = 4,656,162,009.30
5. Step 5: Solve for x
   x = 4,656,162,009.30/78,688.55
6. Step 6: Final answer
   x = 59,172.04