Finding the Fourth Proportional to 9,980.64, 14,971.12 and 4,785.30

Step by Step Solution

1. Step 1: Write the proportion equation
   9,980.64 : 14,971.12 = 4,785.30 : x
2. Step 2: Convert to fraction form
   9,980.64/14,971.12 = 4,785.30/x
3. Step 3: Cross multiply
   9,980.64x = 14,971.12 × 4,785.30
4. Step 4: Simplify right side
   9,980.64x = 71,641,300.54
5. Step 5: Solve for x
   x = 71,641,300.54/9,980.64
6. Step 6: Final answer
   x = 7,178.03