Finding the Fourth Proportional to 12,678.77, 17,498.53 and 7,376.51

Step by Step Solution

1. Step 1: Write the proportion equation
   12,678.77 : 17,498.53 = 7,376.51 : x
2. Step 2: Convert to fraction form
   12,678.77/17,498.53 = 7,376.51/x
3. Step 3: Cross multiply
   12,678.77x = 17,498.53 × 7,376.51
4. Step 4: Simplify right side
   12,678.77x = 129,077,975.60
5. Step 5: Solve for x
   x = 129,077,975.60/12,678.77
6. Step 6: Final answer
   x = 10,180.64