Finding the Fourth Proportional to 1,780.16, 2,666.56 and 1,047.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,780.16 : 2,666.56 = 1,047.48 : x
2. Step 2: Convert to fraction form
   1,780.16/2,666.56 = 1,047.48/x
3. Step 3: Cross multiply
   1,780.16x = 2,666.56 × 1,047.48
4. Step 4: Simplify right side
   1,780.16x = 2,793,168.27
5. Step 5: Solve for x
   x = 2,793,168.27/1,780.16
6. Step 6: Final answer
   x = 1,569.05