Finding the Fourth Proportional to 12,961.17, 17,870.04 and 8,477.82

Step by Step Solution

1. Step 1: Write the proportion equation
   12,961.17 : 17,870.04 = 8,477.82 : x
2. Step 2: Convert to fraction form
   12,961.17/17,870.04 = 8,477.82/x
3. Step 3: Cross multiply
   12,961.17x = 17,870.04 × 8,477.82
4. Step 4: Simplify right side
   12,961.17x = 151,498,982.51
5. Step 5: Solve for x
   x = 151,498,982.51/12,961.17
6. Step 6: Final answer
   x = 11,688.68