Finding the Fourth Proportional to 7,109.61, 10,658.34 and 3,987.06

Step by Step Solution

1. Step 1: Write the proportion equation
   7,109.61 : 10,658.34 = 3,987.06 : x
2. Step 2: Convert to fraction form
   7,109.61/10,658.34 = 3,987.06/x
3. Step 3: Cross multiply
   7,109.61x = 10,658.34 × 3,987.06
4. Step 4: Simplify right side
   7,109.61x = 42,495,441.08
5. Step 5: Solve for x
   x = 42,495,441.08/7,109.61
6. Step 6: Final answer
   x = 5,977.18