Finding the Fourth Proportional to 3,543.68, 5,312.06 and 1,320.89

Step by Step Solution

1. Step 1: Write the proportion equation
   3,543.68 : 5,312.06 = 1,320.89 : x
2. Step 2: Convert to fraction form
   3,543.68/5,312.06 = 1,320.89/x
3. Step 3: Cross multiply
   3,543.68x = 5,312.06 × 1,320.89
4. Step 4: Simplify right side
   3,543.68x = 7,016,644.89
5. Step 5: Solve for x
   x = 7,016,644.89/3,543.68
6. Step 6: Final answer
   x = 1,980.04