Finding the Fourth Proportional to 1,666.06, 2,499.54 and 1,320.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,666.06 : 2,499.54 = 1,320.55 : x
2. Step 2: Convert to fraction form
   1,666.06/2,499.54 = 1,320.55/x
3. Step 3: Cross multiply
   1,666.06x = 2,499.54 × 1,320.55
4. Step 4: Simplify right side
   1,666.06x = 3,300,767.55
5. Step 5: Solve for x
   x = 3,300,767.55/1,666.06
6. Step 6: Final answer
   x = 1,981.18