Finding the Fourth Proportional to 12,961.02, 17,886.79 and 7,655.86

Step by Step Solution

1. Step 1: Write the proportion equation
   12,961.02 : 17,886.79 = 7,655.86 : x
2. Step 2: Convert to fraction form
   12,961.02/17,886.79 = 7,655.86/x
3. Step 3: Cross multiply
   12,961.02x = 17,886.79 × 7,655.86
4. Step 4: Simplify right side
   12,961.02x = 136,938,760.09
5. Step 5: Solve for x
   x = 136,938,760.09/12,961.02
6. Step 6: Final answer
   x = 10,565.43