Finding the Fourth Proportional to 12,972.79, 17,886.33 and 10,820.31

Step by Step Solution

1. Step 1: Write the proportion equation
   12,972.79 : 17,886.33 = 10,820.31 : x
2. Step 2: Convert to fraction form
   12,972.79/17,886.33 = 10,820.31/x
3. Step 3: Cross multiply
   12,972.79x = 17,886.33 × 10,820.31
4. Step 4: Simplify right side
   12,972.79x = 193,535,491.83
5. Step 5: Solve for x
   x = 193,535,491.83/12,972.79
6. Step 6: Final answer
   x = 14,918.57