Finding the Fourth Proportional to 1,139.12, 1,561.73 and 1,118.36

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.12 : 1,561.73 = 1,118.36 : x
2. Step 2: Convert to fraction form
   1,139.12/1,561.73 = 1,118.36/x
3. Step 3: Cross multiply
   1,139.12x = 1,561.73 × 1,118.36
4. Step 4: Simplify right side
   1,139.12x = 1,746,566.61
5. Step 5: Solve for x
   x = 1,746,566.61/1,139.12
6. Step 6: Final answer
   x = 1,533.27