Finding the Fourth Proportional to 1,861.47, 2,791.17 and 766.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,861.47 : 2,791.17 = 766.59 : x
2. Step 2: Convert to fraction form
   1,861.47/2,791.17 = 766.59/x
3. Step 3: Cross multiply
   1,861.47x = 2,791.17 × 766.59
4. Step 4: Simplify right side
   1,861.47x = 2,139,683.01
5. Step 5: Solve for x
   x = 2,139,683.01/1,861.47
6. Step 6: Final answer
   x = 1,149.46