Finding the Fourth Proportional to 1,978.51, 2,730.76 and 1,646.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,978.51 : 2,730.76 = 1,646.61 : x
2. Step 2: Convert to fraction form
   1,978.51/2,730.76 = 1,646.61/x
3. Step 3: Cross multiply
   1,978.51x = 2,730.76 × 1,646.61
4. Step 4: Simplify right side
   1,978.51x = 4,496,496.72
5. Step 5: Solve for x
   x = 4,496,496.72/1,978.51
6. Step 6: Final answer
   x = 2,272.67