Finding the Fourth Proportional to 7,156.72, 9,876.84 and 3,970.32

Step by Step Solution

1. Step 1: Write the proportion equation
   7,156.72 : 9,876.84 = 3,970.32 : x
2. Step 2: Convert to fraction form
   7,156.72/9,876.84 = 3,970.32/x
3. Step 3: Cross multiply
   7,156.72x = 9,876.84 × 3,970.32
4. Step 4: Simplify right side
   7,156.72x = 39,214,215.39
5. Step 5: Solve for x
   x = 39,214,215.39/7,156.72
6. Step 6: Final answer
   x = 5,479.36