Finding the Fourth Proportional to 13,142.64, 19,706.73 and 8,987.34

Step by Step Solution

1. Step 1: Write the proportion equation
   13,142.64 : 19,706.73 = 8,987.34 : x
2. Step 2: Convert to fraction form
   13,142.64/19,706.73 = 8,987.34/x
3. Step 3: Cross multiply
   13,142.64x = 19,706.73 × 8,987.34
4. Step 4: Simplify right side
   13,142.64x = 177,111,082.80
5. Step 5: Solve for x
   x = 177,111,082.80/13,142.64
6. Step 6: Final answer
   x = 13,476.07