Finding the Fourth Proportional to 57,111.52, 85,679.84 and 17,128.88

Step by Step Solution

1. Step 1: Write the proportion equation
   57,111.52 : 85,679.84 = 17,128.88 : x
2. Step 2: Convert to fraction form
   57,111.52/85,679.84 = 17,128.88/x
3. Step 3: Cross multiply
   57,111.52x = 85,679.84 × 17,128.88
4. Step 4: Simplify right side
   57,111.52x = 1,467,599,697.78
5. Step 5: Solve for x
   x = 1,467,599,697.78/57,111.52
6. Step 6: Final answer
   x = 25,697.09