Finding the Fourth Proportional to 21,870.07, 30,184.95 and 12,917.14

Step by Step Solution

1. Step 1: Write the proportion equation
   21,870.07 : 30,184.95 = 12,917.14 : x
2. Step 2: Convert to fraction form
   21,870.07/30,184.95 = 12,917.14/x
3. Step 3: Cross multiply
   21,870.07x = 30,184.95 × 12,917.14
4. Step 4: Simplify right side
   21,870.07x = 389,903,198.02
5. Step 5: Solve for x
   x = 389,903,198.02/21,870.07
6. Step 6: Final answer
   x = 17,828.17