Finding the Fourth Proportional to 1,087.60, 1,501.13 and 689.01

Step by Step Solution

1. Step 1: Write the proportion equation
   1,087.60 : 1,501.13 = 689.01 : x
2. Step 2: Convert to fraction form
   1,087.60/1,501.13 = 689.01/x
3. Step 3: Cross multiply
   1,087.60x = 1,501.13 × 689.01
4. Step 4: Simplify right side
   1,087.60x = 1,034,293.58
5. Step 5: Solve for x
   x = 1,034,293.58/1,087.60
6. Step 6: Final answer
   x = 950.99