Finding the Fourth Proportional to 12,561.30, 17,342.10 and 7,851.96

Step by Step Solution

1. Step 1: Write the proportion equation
   12,561.30 : 17,342.10 = 7,851.96 : x
2. Step 2: Convert to fraction form
   12,561.30/17,342.10 = 7,851.96/x
3. Step 3: Cross multiply
   12,561.30x = 17,342.10 × 7,851.96
4. Step 4: Simplify right side
   12,561.30x = 136,169,475.52
5. Step 5: Solve for x
   x = 136,169,475.52/12,561.30
6. Step 6: Final answer
   x = 10,840.40