Finding the Fourth Proportional to 16,870.80, 25,311.60 and 7,507.20

Step by Step Solution

1. Step 1: Write the proportion equation
   16,870.80 : 25,311.60 = 7,507.20 : x
2. Step 2: Convert to fraction form
   16,870.80/25,311.60 = 7,507.20/x
3. Step 3: Cross multiply
   16,870.80x = 25,311.60 × 7,507.20
4. Step 4: Simplify right side
   16,870.80x = 190,019,243.52
5. Step 5: Solve for x
   x = 190,019,243.52/16,870.80
6. Step 6: Final answer
   x = 11,263.20