Finding the Fourth Proportional to 10,109.55, 15,170.79 and 3,870.12

Step by Step Solution

1. Step 1: Write the proportion equation
   10,109.55 : 15,170.79 = 3,870.12 : x
2. Step 2: Convert to fraction form
   10,109.55/15,170.79 = 3,870.12/x
3. Step 3: Cross multiply
   10,109.55x = 15,170.79 × 3,870.12
4. Step 4: Simplify right side
   10,109.55x = 58,712,777.79
5. Step 5: Solve for x
   x = 58,712,777.79/10,109.55
6. Step 6: Final answer
   x = 5,807.65