Finding the Fourth Proportional to 1,047.57, 1,561.72 and 998.36

Step by Step Solution

1. Step 1: Write the proportion equation
   1,047.57 : 1,561.72 = 998.36 : x
2. Step 2: Convert to fraction form
   1,047.57/1,561.72 = 998.36/x
3. Step 3: Cross multiply
   1,047.57x = 1,561.72 × 998.36
4. Step 4: Simplify right side
   1,047.57x = 1,559,158.78
5. Step 5: Solve for x
   x = 1,559,158.78/1,047.57
6. Step 6: Final answer
   x = 1,488.36