Finding the Fourth Proportional to 1,561.45, 2,153.82 and 1,002.63

Step by Step Solution

1. Step 1: Write the proportion equation
   1,561.45 : 2,153.82 = 1,002.63 : x
2. Step 2: Convert to fraction form
   1,561.45/2,153.82 = 1,002.63/x
3. Step 3: Cross multiply
   1,561.45x = 2,153.82 × 1,002.63
4. Step 4: Simplify right side
   1,561.45x = 2,159,475.81
5. Step 5: Solve for x
   x = 2,159,475.81/1,561.45
6. Step 6: Final answer
   x = 1,382.99