Finding the Fourth Proportional to 1,320.86, 1,978.17 and 1,047.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,320.86 : 1,978.17 = 1,047.10 : x
2. Step 2: Convert to fraction form
   1,320.86/1,978.17 = 1,047.10/x
3. Step 3: Cross multiply
   1,320.86x = 1,978.17 × 1,047.10
4. Step 4: Simplify right side
   1,320.86x = 2,071,348.10
5. Step 5: Solve for x
   x = 2,071,348.10/1,320.86
6. Step 6: Final answer
   x = 1,568.19