Finding the Fourth Proportional to 1,320.91, 1,972.69 and 1,061.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,320.91 : 1,972.69 = 1,061.30 : x
2. Step 2: Convert to fraction form
   1,320.91/1,972.69 = 1,061.30/x
3. Step 3: Cross multiply
   1,320.91x = 1,972.69 × 1,061.30
4. Step 4: Simplify right side
   1,320.91x = 2,093,618.18
5. Step 5: Solve for x
   x = 2,093,618.18/1,320.91
6. Step 6: Final answer
   x = 1,584.98