Finding the Fourth Proportional to 1,158.99, 1,598.47 and 1,018.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,158.99 : 1,598.47 = 1,018.81 : x
2. Step 2: Convert to fraction form
   1,158.99/1,598.47 = 1,018.81/x
3. Step 3: Cross multiply
   1,158.99x = 1,598.47 × 1,018.81
4. Step 4: Simplify right side
   1,158.99x = 1,628,538.86
5. Step 5: Solve for x
   x = 1,628,538.86/1,158.99
6. Step 6: Final answer
   x = 1,405.14