Finding the Fourth Proportional to 12,887.98, 17,784.48 and 7,221.94

Step by Step Solution

1. Step 1: Write the proportion equation
   12,887.98 : 17,784.48 = 7,221.94 : x
2. Step 2: Convert to fraction form
   12,887.98/17,784.48 = 7,221.94/x
3. Step 3: Cross multiply
   12,887.98x = 17,784.48 × 7,221.94
4. Step 4: Simplify right side
   12,887.98x = 128,438,447.49
5. Step 5: Solve for x
   x = 128,438,447.49/12,887.98
6. Step 6: Final answer
   x = 9,965.75