Finding the Fourth Proportional to 10,987.99, 15,188.34 and 10,116.10

Step by Step Solution

1. Step 1: Write the proportion equation
   10,987.99 : 15,188.34 = 10,116.10 : x
2. Step 2: Convert to fraction form
   10,987.99/15,188.34 = 10,116.10/x
3. Step 3: Cross multiply
   10,987.99x = 15,188.34 × 10,116.10
4. Step 4: Simplify right side
   10,987.99x = 153,646,766.27
5. Step 5: Solve for x
   x = 153,646,766.27/10,987.99
6. Step 6: Final answer
   x = 13,983.15