Finding the Fourth Proportional to 71,667.87, 98,572.86 and 57,489.63

Step by Step Solution

1. Step 1: Write the proportion equation
   71,667.87 : 98,572.86 = 57,489.63 : x
2. Step 2: Convert to fraction form
   71,667.87/98,572.86 = 57,489.63/x
3. Step 3: Cross multiply
   71,667.87x = 98,572.86 × 57,489.63
4. Step 4: Simplify right side
   71,667.87x = 5,666,917,249.44
5. Step 5: Solve for x
   x = 5,666,917,249.44/71,667.87
6. Step 6: Final answer
   x = 79,071.94