Finding the Fourth Proportional to 12,993.60, 17,934.74 and 7,690.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,993.60 : 17,934.74 = 7,690.12 : x
2. Step 2: Convert to fraction form
   12,993.60/17,934.74 = 7,690.12/x
3. Step 3: Cross multiply
   12,993.60x = 17,934.74 × 7,690.12
4. Step 4: Simplify right side
   12,993.60x = 137,920,302.77
5. Step 5: Solve for x
   x = 137,920,302.77/12,993.60
6. Step 6: Final answer
   x = 10,614.48