Finding the Fourth Proportional to 13,987.16, 19,302.78 and 7,700.12

Step by Step Solution

1. Step 1: Write the proportion equation
   13,987.16 : 19,302.78 = 7,700.12 : x
2. Step 2: Convert to fraction form
   13,987.16/19,302.78 = 7,700.12/x
3. Step 3: Cross multiply
   13,987.16x = 19,302.78 × 7,700.12
4. Step 4: Simplify right side
   13,987.16x = 148,633,722.33
5. Step 5: Solve for x
   x = 148,633,722.33/13,987.16
6. Step 6: Final answer
   x = 10,626.44