Finding the Fourth Proportional to 9,978.70, 14,980.20 and 5,045.80

Step by Step Solution

1. Step 1: Write the proportion equation
   9,978.70 : 14,980.20 = 5,045.80 : x
2. Step 2: Convert to fraction form
   9,978.70/14,980.20 = 5,045.80/x
3. Step 3: Cross multiply
   9,978.70x = 14,980.20 × 5,045.80
4. Step 4: Simplify right side
   9,978.70x = 75,587,093.16
5. Step 5: Solve for x
   x = 75,587,093.16/9,978.70
6. Step 6: Final answer
   x = 7,574.84