Finding the Fourth Proportional to 17,139.51, 25,672.80 and 10,111.95

Step by Step Solution

1. Step 1: Write the proportion equation
   17,139.51 : 25,672.80 = 10,111.95 : x
2. Step 2: Convert to fraction form
   17,139.51/25,672.80 = 10,111.95/x
3. Step 3: Cross multiply
   17,139.51x = 25,672.80 × 10,111.95
4. Step 4: Simplify right side
   17,139.51x = 259,602,069.96
5. Step 5: Solve for x
   x = 259,602,069.96/17,139.51
6. Step 6: Final answer
   x = 15,146.41