Finding the Fourth Proportional to 1,315.72, 1,973.52 and 493.93

Step by Step Solution

1. Step 1: Write the proportion equation
   1,315.72 : 1,973.52 = 493.93 : x
2. Step 2: Convert to fraction form
   1,315.72/1,973.52 = 493.93/x
3. Step 3: Cross multiply
   1,315.72x = 1,973.52 × 493.93
4. Step 4: Simplify right side
   1,315.72x = 974,780.73
5. Step 5: Solve for x
   x = 974,780.73/1,315.72
6. Step 6: Final answer
   x = 740.87