Finding the Fourth Proportional to 72,681.72, 100,279.26 and 42,459

Step by Step Solution

1. Step 1: Write the proportion equation
   72,681.72 : 100,279.26 = 42,459 : x
2. Step 2: Convert to fraction form
   72,681.72/100,279.26 = 42,459/x
3. Step 3: Cross multiply
   72,681.72x = 100,279.26 × 42,459
4. Step 4: Simplify right side
   72,681.72x = 4,257,757,100.34
5. Step 5: Solve for x
   x = 4,257,757,100.34/72,681.72
6. Step 6: Final answer
   x = 58,580.85