Finding the Fourth Proportional to 1,012.92, 1,522.43 and 991.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,012.92 : 1,522.43 = 991.35 : x
2. Step 2: Convert to fraction form
   1,012.92/1,522.43 = 991.35/x
3. Step 3: Cross multiply
   1,012.92x = 1,522.43 × 991.35
4. Step 4: Simplify right side
   1,012.92x = 1,509,256.02
5. Step 5: Solve for x
   x = 1,509,256.02/1,012.92
6. Step 6: Final answer
   x = 1,490.01