Finding the Fourth Proportional to 12,981.88, 17,916.72 and 7,317.70

Step by Step Solution

1. Step 1: Write the proportion equation
   12,981.88 : 17,916.72 = 7,317.70 : x
2. Step 2: Convert to fraction form
   12,981.88/17,916.72 = 7,317.70/x
3. Step 3: Cross multiply
   12,981.88x = 17,916.72 × 7,317.70
4. Step 4: Simplify right side
   12,981.88x = 131,109,181.94
5. Step 5: Solve for x
   x = 131,109,181.94/12,981.88
6. Step 6: Final answer
   x = 10,099.40