Finding the Fourth Proportional to 12,875.74, 17,774.61 and 9,690.28

Step by Step Solution

1. Step 1: Write the proportion equation
   12,875.74 : 17,774.61 = 9,690.28 : x
2. Step 2: Convert to fraction form
   12,875.74/17,774.61 = 9,690.28/x
3. Step 3: Cross multiply
   12,875.74x = 17,774.61 × 9,690.28
4. Step 4: Simplify right side
   12,875.74x = 172,240,867.02
5. Step 5: Solve for x
   x = 172,240,867.02/12,875.74
6. Step 6: Final answer
   x = 13,377.17