Finding the Fourth Proportional to 1,320.12, 1,980.59 and 1,046.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,320.12 : 1,980.59 = 1,046.34 : x
2. Step 2: Convert to fraction form
   1,320.12/1,980.59 = 1,046.34/x
3. Step 3: Cross multiply
   1,320.12x = 1,980.59 × 1,046.34
4. Step 4: Simplify right side
   1,320.12x = 2,072,365.31
5. Step 5: Solve for x
   x = 2,072,365.31/1,320.12
6. Step 6: Final answer
   x = 1,569.83