Finding the Fourth Proportional to 7,124.72, 9,832.50 and 3,980.90

Step by Step Solution

1. Step 1: Write the proportion equation
   7,124.72 : 9,832.50 = 3,980.90 : x
2. Step 2: Convert to fraction form
   7,124.72/9,832.50 = 3,980.90/x
3. Step 3: Cross multiply
   7,124.72x = 9,832.50 × 3,980.90
4. Step 4: Simplify right side
   7,124.72x = 39,142,199.25
5. Step 5: Solve for x
   x = 39,142,199.25/7,124.72
6. Step 6: Final answer
   x = 5,493.86