Finding the Fourth Proportional to 12,801.76, 17,666.42 and 7,212.76

Step by Step Solution

1. Step 1: Write the proportion equation
   12,801.76 : 17,666.42 = 7,212.76 : x
2. Step 2: Convert to fraction form
   12,801.76/17,666.42 = 7,212.76/x
3. Step 3: Cross multiply
   12,801.76x = 17,666.42 × 7,212.76
4. Step 4: Simplify right side
   12,801.76x = 127,423,647.52
5. Step 5: Solve for x
   x = 127,423,647.52/12,801.76
6. Step 6: Final answer
   x = 9,953.60