Finding the Fourth Proportional to 7,155.31, 10,736.06 and 3,870.72

Step by Step Solution

1. Step 1: Write the proportion equation
   7,155.31 : 10,736.06 = 3,870.72 : x
2. Step 2: Convert to fraction form
   7,155.31/10,736.06 = 3,870.72/x
3. Step 3: Cross multiply
   7,155.31x = 10,736.06 × 3,870.72
4. Step 4: Simplify right side
   7,155.31x = 41,556,209.13
5. Step 5: Solve for x
   x = 41,556,209.13/7,155.31
6. Step 6: Final answer
   x = 5,807.74