Finding the Fourth Proportional to 1,970.02, 2,717.96 and 1,223.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,970.02 : 2,717.96 = 1,223.72 : x
2. Step 2: Convert to fraction form
   1,970.02/2,717.96 = 1,223.72/x
3. Step 3: Cross multiply
   1,970.02x = 2,717.96 × 1,223.72
4. Step 4: Simplify right side
   1,970.02x = 3,326,022.01
5. Step 5: Solve for x
   x = 3,326,022.01/1,970.02
6. Step 6: Final answer
   x = 1,688.32