Finding the Fourth Proportional to 1,156.02, 1,591.32 and 999.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,156.02 : 1,591.32 = 999.18 : x
2. Step 2: Convert to fraction form
   1,156.02/1,591.32 = 999.18/x
3. Step 3: Cross multiply
   1,156.02x = 1,591.32 × 999.18
4. Step 4: Simplify right side
   1,156.02x = 1,590,015.12
5. Step 5: Solve for x
   x = 1,590,015.12/1,156.02
6. Step 6: Final answer
   x = 1,375.42