Finding the Fourth Proportional to 1,079.58, 1,490.01 and 631.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,079.58 : 1,490.01 = 631.50 : x
2. Step 2: Convert to fraction form
   1,079.58/1,490.01 = 631.50/x
3. Step 3: Cross multiply
   1,079.58x = 1,490.01 × 631.50
4. Step 4: Simplify right side
   1,079.58x = 940,941.32
5. Step 5: Solve for x
   x = 940,941.32/1,079.58
6. Step 6: Final answer
   x = 871.58