Finding the Fourth Proportional to 12,991.51, 17,917.86 and 8,741.17

Step by Step Solution

1. Step 1: Write the proportion equation
   12,991.51 : 17,917.86 = 8,741.17 : x
2. Step 2: Convert to fraction form
   12,991.51/17,917.86 = 8,741.17/x
3. Step 3: Cross multiply
   12,991.51x = 17,917.86 × 8,741.17
4. Step 4: Simplify right side
   12,991.51x = 156,623,060.30
5. Step 5: Solve for x
   x = 156,623,060.30/12,991.51
6. Step 6: Final answer
   x = 12,055.80