Finding the Fourth Proportional to 12,677.80, 17,499.72 and 7,374.28

Step by Step Solution

1. Step 1: Write the proportion equation
   12,677.80 : 17,499.72 = 7,374.28 : x
2. Step 2: Convert to fraction form
   12,677.80/17,499.72 = 7,374.28/x
3. Step 3: Cross multiply
   12,677.80x = 17,499.72 × 7,374.28
4. Step 4: Simplify right side
   12,677.80x = 129,047,835.20
5. Step 5: Solve for x
   x = 129,047,835.20/12,677.80
6. Step 6: Final answer
   x = 10,179.04