Finding the Fourth Proportional to 78,727.90, 108,642.98 and 42,918.17

Step by Step Solution

1. Step 1: Write the proportion equation
   78,727.90 : 108,642.98 = 42,918.17 : x
2. Step 2: Convert to fraction form
   78,727.90/108,642.98 = 42,918.17/x
3. Step 3: Cross multiply
   78,727.90x = 108,642.98 × 42,918.17
4. Step 4: Simplify right side
   78,727.90x = 4,662,757,662.16
5. Step 5: Solve for x
   x = 4,662,757,662.16/78,727.90
6. Step 6: Final answer
   x = 59,226.24