Finding the Fourth Proportional to 78,688.14, 108,589.16 and 42,878.04

Step by Step Solution

1. Step 1: Write the proportion equation
   78,688.14 : 108,589.16 = 42,878.04 : x
2. Step 2: Convert to fraction form
   78,688.14/108,589.16 = 42,878.04/x
3. Step 3: Cross multiply
   78,688.14x = 108,589.16 × 42,878.04
4. Step 4: Simplify right side
   78,688.14x = 4,656,090,131.66
5. Step 5: Solve for x
   x = 4,656,090,131.66/78,688.14
6. Step 6: Final answer
   x = 59,171.43