Finding the Fourth Proportional to 1,561.46, 2,155.56 and 1,002.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,561.46 : 2,155.56 = 1,002.76 : x
2. Step 2: Convert to fraction form
   1,561.46/2,155.56 = 1,002.76/x
3. Step 3: Cross multiply
   1,561.46x = 2,155.56 × 1,002.76
4. Step 4: Simplify right side
   1,561.46x = 2,161,503.96
5. Step 5: Solve for x
   x = 2,161,503.96/1,561.46
6. Step 6: Final answer
   x = 1,384.29