Finding the Fourth Proportional to 1,187.47, 1,641.69 and 1,136.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,187.47 : 1,641.69 = 1,136.17 : x
2. Step 2: Convert to fraction form
   1,187.47/1,641.69 = 1,136.17/x
3. Step 3: Cross multiply
   1,187.47x = 1,641.69 × 1,136.17
4. Step 4: Simplify right side
   1,187.47x = 1,865,225.04
5. Step 5: Solve for x
   x = 1,865,225.04/1,187.47
6. Step 6: Final answer
   x = 1,570.76