Finding the Fourth Proportional to 1,161.89, 1,602.59 and 986.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,161.89 : 1,602.59 = 986.02 : x
2. Step 2: Convert to fraction form
   1,161.89/1,602.59 = 986.02/x
3. Step 3: Cross multiply
   1,161.89x = 1,602.59 × 986.02
4. Step 4: Simplify right side
   1,161.89x = 1,580,184.25
5. Step 5: Solve for x
   x = 1,580,184.25/1,161.89
6. Step 6: Final answer
   x = 1,360.02