Finding the Fourth Proportional to 2,143.06, 3,213.83 and 972.08

Step by Step Solution

1. Step 1: Write the proportion equation
   2,143.06 : 3,213.83 = 972.08 : x
2. Step 2: Convert to fraction form
   2,143.06/3,213.83 = 972.08/x
3. Step 3: Cross multiply
   2,143.06x = 3,213.83 × 972.08
4. Step 4: Simplify right side
   2,143.06x = 3,124,083.77
5. Step 5: Solve for x
   x = 3,124,083.77/2,143.06
6. Step 6: Final answer
   x = 1,457.77