Finding the Fourth Proportional to 12,865.30, 17,749.47 and 7,827.91

Step by Step Solution

1. Step 1: Write the proportion equation
   12,865.30 : 17,749.47 = 7,827.91 : x
2. Step 2: Convert to fraction form
   12,865.30/17,749.47 = 7,827.91/x
3. Step 3: Cross multiply
   12,865.30x = 17,749.47 × 7,827.91
4. Step 4: Simplify right side
   12,865.30x = 138,941,253.71
5. Step 5: Solve for x
   x = 138,941,253.71/12,865.30
6. Step 6: Final answer
   x = 10,799.69