Finding the Fourth Proportional to 12,887.31, 17,778.18 and 8,113.17

Step by Step Solution

1. Step 1: Write the proportion equation
   12,887.31 : 17,778.18 = 8,113.17 : x
2. Step 2: Convert to fraction form
   12,887.31/17,778.18 = 8,113.17/x
3. Step 3: Cross multiply
   12,887.31x = 17,778.18 × 8,113.17
4. Step 4: Simplify right side
   12,887.31x = 144,237,396.63
5. Step 5: Solve for x
   x = 144,237,396.63/12,887.31
6. Step 6: Final answer
   x = 11,192.20