Finding the Fourth Proportional to 12,721.86, 17,556.21 and 7,132.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,721.86 : 17,556.21 = 7,132.50 : x
2. Step 2: Convert to fraction form
   12,721.86/17,556.21 = 7,132.50/x
3. Step 3: Cross multiply
   12,721.86x = 17,556.21 × 7,132.50
4. Step 4: Simplify right side
   12,721.86x = 125,219,667.83
5. Step 5: Solve for x
   x = 125,219,667.83/12,721.86
6. Step 6: Final answer
   x = 9,842.87