Finding the Fourth Proportional to 1,089.50, 1,502.10 and 715.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,089.50 : 1,502.10 = 715.82 : x
2. Step 2: Convert to fraction form
   1,089.50/1,502.10 = 715.82/x
3. Step 3: Cross multiply
   1,089.50x = 1,502.10 × 715.82
4. Step 4: Simplify right side
   1,089.50x = 1,075,233.22
5. Step 5: Solve for x
   x = 1,075,233.22/1,089.50
6. Step 6: Final answer
   x = 986.91