Finding the Fourth Proportional to 12,498.52, 17,251.38 and 7,780

Step by Step Solution

1. Step 1: Write the proportion equation
   12,498.52 : 17,251.38 = 7,780 : x
2. Step 2: Convert to fraction form
   12,498.52/17,251.38 = 7,780/x
3. Step 3: Cross multiply
   12,498.52x = 17,251.38 × 7,780
4. Step 4: Simplify right side
   12,498.52x = 134,215,736.40
5. Step 5: Solve for x
   x = 134,215,736.40/12,498.52
6. Step 6: Final answer
   x = 10,738.53