Finding the Fourth Proportional to 1,458.51, 2,012.07 and 985.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,458.51 : 2,012.07 = 985.80 : x
2. Step 2: Convert to fraction form
   1,458.51/2,012.07 = 985.80/x
3. Step 3: Cross multiply
   1,458.51x = 2,012.07 × 985.80
4. Step 4: Simplify right side
   1,458.51x = 1,983,498.61
5. Step 5: Solve for x
   x = 1,983,498.61/1,458.51
6. Step 6: Final answer
   x = 1,359.95