Finding the Fourth Proportional to 21,118.71, 31,685.10 and 7,080.12

Step by Step Solution

1. Step 1: Write the proportion equation
   21,118.71 : 31,685.10 = 7,080.12 : x
2. Step 2: Convert to fraction form
   21,118.71/31,685.10 = 7,080.12/x
3. Step 3: Cross multiply
   21,118.71x = 31,685.10 × 7,080.12
4. Step 4: Simplify right side
   21,118.71x = 224,334,274.81
5. Step 5: Solve for x
   x = 224,334,274.81/21,118.71
6. Step 6: Final answer
   x = 10,622.54