Finding the Fourth Proportional to 10,111.74, 15,157.35 and 3,870.15

Step by Step Solution

1. Step 1: Write the proportion equation
   10,111.74 : 15,157.35 = 3,870.15 : x
2. Step 2: Convert to fraction form
   10,111.74/15,157.35 = 3,870.15/x
3. Step 3: Cross multiply
   10,111.74x = 15,157.35 × 3,870.15
4. Step 4: Simplify right side
   10,111.74x = 58,661,218.10
5. Step 5: Solve for x
   x = 58,661,218.10/10,111.74
6. Step 6: Final answer
   x = 5,801.30