Finding the Fourth Proportional to 915.31, 1,371.72 and 503.83

Step by Step Solution

1. Step 1: Write the proportion equation
   915.31 : 1,371.72 = 503.83 : x
2. Step 2: Convert to fraction form
   915.31/1,371.72 = 503.83/x
3. Step 3: Cross multiply
   915.31x = 1,371.72 × 503.83
4. Step 4: Simplify right side
   915.31x = 691,106.83
5. Step 5: Solve for x
   x = 691,106.83/915.31
6. Step 6: Final answer
   x = 755.06