Finding the Fourth Proportional to 1,180.02, 1,621.76 and 917.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,180.02 : 1,621.76 = 917.58 : x
2. Step 2: Convert to fraction form
   1,180.02/1,621.76 = 917.58/x
3. Step 3: Cross multiply
   1,180.02x = 1,621.76 × 917.58
4. Step 4: Simplify right side
   1,180.02x = 1,488,086.43
5. Step 5: Solve for x
   x = 1,488,086.43/1,180.02
6. Step 6: Final answer
   x = 1,261.07