Finding the Fourth Proportional to 9,980.80, 14,978.40 and 4,790.24

Step by Step Solution

1. Step 1: Write the proportion equation
   9,980.80 : 14,978.40 = 4,790.24 : x
2. Step 2: Convert to fraction form
   9,980.80/14,978.40 = 4,790.24/x
3. Step 3: Cross multiply
   9,980.80x = 14,978.40 × 4,790.24
4. Step 4: Simplify right side
   9,980.80x = 71,750,130.82
5. Step 5: Solve for x
   x = 71,750,130.82/9,980.80
6. Step 6: Final answer
   x = 7,188.82