Finding the Fourth Proportional to 1,490.21, 2,236.71 and 760.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,490.21 : 2,236.71 = 760.31 : x
2. Step 2: Convert to fraction form
   1,490.21/2,236.71 = 760.31/x
3. Step 3: Cross multiply
   1,490.21x = 2,236.71 × 760.31
4. Step 4: Simplify right side
   1,490.21x = 1,700,592.98
5. Step 5: Solve for x
   x = 1,700,592.98/1,490.21
6. Step 6: Final answer
   x = 1,141.18