Finding the Fourth Proportional to 2,160.51, 2,978.31 and 1,529.07

Step by Step Solution

1. Step 1: Write the proportion equation
   2,160.51 : 2,978.31 = 1,529.07 : x
2. Step 2: Convert to fraction form
   2,160.51/2,978.31 = 1,529.07/x
3. Step 3: Cross multiply
   2,160.51x = 2,978.31 × 1,529.07
4. Step 4: Simplify right side
   2,160.51x = 4,554,044.47
5. Step 5: Solve for x
   x = 4,554,044.47/2,160.51
6. Step 6: Final answer
   x = 2,107.86