Finding the Fourth Proportional to 1,051.59, 1,450.74 and 719.90

Step by Step Solution

1. Step 1: Write the proportion equation
   1,051.59 : 1,450.74 = 719.90 : x
2. Step 2: Convert to fraction form
   1,051.59/1,450.74 = 719.90/x
3. Step 3: Cross multiply
   1,051.59x = 1,450.74 × 719.90
4. Step 4: Simplify right side
   1,051.59x = 1,044,388.61
5. Step 5: Solve for x
   x = 1,044,388.61/1,051.59
6. Step 6: Final answer
   x = 993.15