Finding the Fourth Proportional to 7,116.33, 9,820.80 and 3,972.72

Step by Step Solution

1. Step 1: Write the proportion equation
   7,116.33 : 9,820.80 = 3,972.72 : x
2. Step 2: Convert to fraction form
   7,116.33/9,820.80 = 3,972.72/x
3. Step 3: Cross multiply
   7,116.33x = 9,820.80 × 3,972.72
4. Step 4: Simplify right side
   7,116.33x = 39,015,288.58
5. Step 5: Solve for x
   x = 39,015,288.58/7,116.33
6. Step 6: Final answer
   x = 5,482.50