Finding the Fourth Proportional to 12,178.56, 16,789.68 and 7,700.07

Step by Step Solution

1. Step 1: Write the proportion equation
   12,178.56 : 16,789.68 = 7,700.07 : x
2. Step 2: Convert to fraction form
   12,178.56/16,789.68 = 7,700.07/x
3. Step 3: Cross multiply
   12,178.56x = 16,789.68 × 7,700.07
4. Step 4: Simplify right side
   12,178.56x = 129,281,711.28
5. Step 5: Solve for x
   x = 129,281,711.28/12,178.56
6. Step 6: Final answer
   x = 10,615.52