Finding the Fourth Proportional to 78,667.74, 108,560.88 and 42,857.64

Step by Step Solution

1. Step 1: Write the proportion equation
   78,667.74 : 108,560.88 = 42,857.64 : x
2. Step 2: Convert to fraction form
   78,667.74/108,560.88 = 42,857.64/x
3. Step 3: Cross multiply
   78,667.74x = 108,560.88 × 42,857.64
4. Step 4: Simplify right side
   78,667.74x = 4,652,663,113.12
5. Step 5: Solve for x
   x = 4,652,663,113.12/78,667.74
6. Step 6: Final answer
   x = 59,143.22