Finding the Fourth Proportional to 12,976.71, 17,889.98 and 9,788.55

Step by Step Solution

1. Step 1: Write the proportion equation
   12,976.71 : 17,889.98 = 9,788.55 : x
2. Step 2: Convert to fraction form
   12,976.71/17,889.98 = 9,788.55/x
3. Step 3: Cross multiply
   12,976.71x = 17,889.98 × 9,788.55
4. Step 4: Simplify right side
   12,976.71x = 175,116,914.79
5. Step 5: Solve for x
   x = 175,116,914.79/12,976.71
6. Step 6: Final answer
   x = 13,494.71